27th IUGG General Assembly |International Association of Geomagnetism and Aeronomy (IAGA) > A| 2019

ASSOCIATION SYMPOSIA [ IAGA ]

A01 – Planetary Magnetic Fields and Secular Variations

Convener: Ingo Wardinski (France)

Co-Conveners: Phil Livermore (UK), Nicolas Gillet (France), Daniel Lathrop (USA), Sanja Panovska (Germany), Rachel Bailey (Austria), Ciaran Beggan (UK)

Description

Magnetic fields are a fundamental characteristic of the Earth and other planetary bodies, whose diverse structures are the manifestation of a range of internal physical processes. Studies of magnetic fields provide insights to dynamical processes within their cores, on their surfaces (e.g. within oceans), and in their ionospheres and magnetospheres. Furthermore, their existence may allow inferences of electrical mantle conductivity and the history of planetary surfaces. These studies are facilitated by data collected from a fleet of space probes around the Earth and probes sent to other planets. This symposium wishes to combine ideas in modelling, observations and theory applied to Earth's and planetary magnetic fields.

A02 - The Role of Iron Containing Minerals in Earth and Extraterrestrial Environments

Conveners: Vadim Kravchinsky (Canada), Adrian Muxworthy (UK)

Description

Whether we are looking at the history of rocks and sediments beneath our feet or meteorites from space, whether we are looking at paleoenvironmental signals, biogenic magnetism or paleointensities, the role of iron containing minerals are fundamental to all of these signals. In this symposium we bring together the broad spectrum of applied and theoretical mineral magnetism. This covers, among other things, fundamentals of mineral magnetism, advances in (extraterrestrial) rock magnetic methods and techniques, as well as applications to paleoenvironmental reconstructions, understanding the fidelity of paleomagnetic signals, pollution monitoring, and biomagnetism.

Particularly welcomed are theoretical and experimental studies aimed at resolving open questions in diagnosis in sediments, paleointensity determination, lock-in mechanism of remanent magnetization, soil iron oxides pedogenesis and their interrelations with environmental factors and biomineralization.

A03 - Coupling Processes in the Atmosphere-Ionosphere (DivII-C/ICMA/SCOSTEP/ICDC)

Convener: Petra Knizova (Czech Republic)

Co-Conveners: Erdal Yigit (USA), Subramanian Gurubaran (India), Christina Arras (Germany)

Description

The objective of this symposium is to bring new insights into the understanding of the coupling processes in the atmosphere-ionosphere system. The symposium will address fundamendal physical processes covering whole atmosphere system. It covers various dynamical, chemical, and electrodynamical processes. The coupled effects can be expressed in terms of the modulation of waves from the lower to the upper atmosphere as well as from low- to high-latitudes, electrodynamic and compositional changes, plasma drifts, electric fields and plasma irregularities at different latitudinal regions of the globe due to the varying energy inputs. Middle atmospheric dynamics, and particularly atmospheric waves, play a leading role in determining the variability of the atmosphere-ionosphere system. The MLT region is a critical region in the coupling between the lower/middle atmosphere and the upper atmosphere/ionosphere. It represents a physical filter and shape the flux of waves ascending through the mesosphere into the overlying thermosphere. The manner in which the couplings take place due to varying energy inputs from the Sun and from the lower atmosphere is a question that is yet to be understood. This symposium solicits papers dealing with experiments, observations, modeling and data analysis that describe the effects of atmospheric coupling processes within the whole atmosphere-ionosphere system. The symposium will be particularly focused on the dependence of coupling processes on the solar and geomagnetic activity, the downward control effects transferring from the strongly solar dependent structure to the lower atmospheric levels and upward propagating structures induced in the lower atmosphere by changing solar activity. Theoretical and empirical results concerning the coupling mechanisms are invited. Symposium proposed in cooperation of International Commission on the Middle Atmosphere (ICMA) of the International Association of Meteorology and Atmospheric Science (IAMAS), the Scientific Committee on Solar Terrestrial Physics (SCOSTEP) and Interdivisional Commission on Developing Countries (ICDC).

A04 - Advances in Mid, Low Latitude and Equatorial Aeronomy

Convener: Paulo Roberto Fagundes (Brazil)

Co-Conveners: John Bosco Habaruliema (South Africa), Maxim Klimenko (Russia), Biqiang Zhao (China)

Description

The occurrence of equatorial spread-F, plasma bubbles, equatorial ionization anomaly (EIA), equatorial electrojet (EEJ) and the development of the F3-layer present a strong day-to-day variability, mainly caused by the ionospheric electrodynamics, thermospheric wind and wave actions (gravity waves, tides, planetary waves, TIDs and MSTIDs). Recent multi-instrument and multi-site observations, as well as, theoretical and simulation investigations have advanced our understanding of these phenomena, both during quiet and disturbed periods including geomagnetic storm and substorm, solar eclipse and solar flare, sudden stratospheric warming and different meteorological events.The objective of this symposium is to bring together experimentalists and theoreticians to survey the latest results, examine new ideas and concepts, and to indicate important future directions in equatorial and low-latitude research..

A05 - Long-Term Trends and Changes in the Stratosphere-Mesosphere-Thermosphere-Ionosphere Systém

Convener: Jan Lastovicka (Czech Republic)

Co-Conveners: Gufran Beig (India)

Description

Greenhouse gases and other drivers cause long-term trends in the stratosphere-mesosphere-thermosphere-ionosphere system, which are much stronger than tropospheric trends. Papers on progress in investigating trends in the stratosphere, mesosphere, thermosphere and ionosphere, dealing with ground-based as well as satellite-borne observations, model simulations, theoretical analyses, long-term data quality issues, methods of determination of trends, and related laboratory experiments, are welcome. Particular attention will be paid to papers dealing with key problems like trends in atmospheric waves, and to papers dealing with open problems or contradictory results, to papers oriented to synthesis of various results, to papers dealing with modeling long-term trends. Special interest is in papers dealing with various trend drivers (CO2, ozone, solar and geomagnetic activity, secular variation of geomagnetic field etc.), their temporal evolution and their relative roles in trends.

A06 - Energetic Particle Precipitation into the Atmosphere: Sources and Atmospheric Impacts

Convener: Craig Rodger (New Zealand)

Co-Conveners: Mark Clilverd (UK), Bernd Funke (Spain), Hilde Nesse Tyssoy (Norway)

Invited speakers: Cora Randall (USA), Drew Turner (USA)

Description

This symposium is targeted at both satellite and ground-based and experimental observations, as well as theoretical investigations, into the precipitation of energetic particles into the D-region ionosphere and below. Particle precipitation into the atmosphere is one of the mechanisms for energetic electron loss from the Van Allen radiation belts. This is particularly significant during and after geomagnetic storms, when the loss rate, and the source population, can both increase. Submissions describing other examples of energetic particle precipitation affecting the mesosphere and stratosphere, for example solar proton events or hard-spectrum substorm precipitation, are also relevant for this symposium. Papers considering the precipitation drivers, the nature of the particle fluxes, or the impact of the precipitation on the ionosphere or atmosphere are welcome. We particularly welcome observations of atmospheric chemical changes caused by energetic particles, new measurements from Arase, the Van Allen Radiation Belt Storm Probes, BARREL balloon campaigns showing energetic electron loss examples, or approaches showing how electron precipitation impacts can be applied by the atmospheric community. Results from the SCOSTEP SPeCIMEN and ROSMIC programmes, as well as from SPARC’s SOLARIS-HEPPA activity are solicited.

A07 - The Earth’s Radiation Belts and Plasmasphere: Observations and Modelling of the Wave, Ring Current, Energetic Particle, and Cold Plasma Environments

Convener: Jacob Bortnik (USA)

Co-Conveners: Scot R. Elkington (USA), Janos Lichtenberger (Hungary), Anders Jorgensen (USA), Balázs Heilig (Hungary)

Description

The inner magnetosphere is a highly complex and variable environment which consists of the coupled plasmasphere, ring current, and radiation belts. Recent progress in the understanding of plasmaspheric dynamics, radiation-belt energization and loss processes, as well as ring-current build-up and decay, has shown that the system is highly variable, and relies on a variety of different waves and other transient phenomena to couple the dynamic processes occurring in the inner magnetosphere. Multiple energization and loss process occur simultaneously, mediated by the cold plasma density, taking place over a variety of spatial scales ranging from microscopic wave-particle interactions, to global-scale interactions, and a variety of temporal scales, from milliseconds to hours. In this symposium, we will focus on the dynamical behaviour of the plasmasphere, radiation-belt and ring-current particles, the global variability and coupling to the inner magnetosphere, and the nature and spatiotemporal distribution of the underlying waves that control this behaviour.

This symposium focuses on:

Ground based remote-sensing techniques, including measurements using ULF-ELF-VLF electromagnetic waves,
In-situ satellite-based measurements, from a number of recent satellite missions including the Van Allen Probes, Themis, and MMS missions and other satellite radio sounding and imaging experiments, and
Advances on various modelling approaches of the plasmasphere, radiation belts and ring current using physics-based, statistical, and machine-learning based techniques.

A08 - ULF Waves in the Magnetosphere (DIV III)

Convener: Kazue Takahashi (USA)

Co-Conveners: Michael Hartinger (USA), Dong-Hun Lee (Korea)

Description

ULF waves transport energy throughout planetary magnetospheres and interact with charged particle populations. Observations of these waves in space, from the ionosphere and ground provide a wealth of information on the dynamics of energy exchange and transport. This is the ULF wave symposium and invites all papers including, but not limited to, transfer and dynamics of the magnetopause, generation and propagation of waves in the magnetosphere, wave-particle interactions and energization, effects in and by the plasmasphere and ionosphere, ground-based observations and observations from other magnetized planets. Simulation studies are welcome.

A09 - Reporter Review for Division III

Convener: Michael Hartinger (USA), Clare Watt (UK)

Description

New and exciting research from Division III scientists published in 2017-2019 will be summarized by the Reporters. Topics include: Auroral processes, ULF waves, magnetotail dynamics, wave-particle interactions in the inner magnetosphere, magnetopause and boundary layers, global magnetospheric dynamics, magnetic reconnection, magnetosphere-ionosphere interactions, and solar wind-magnetosphere interactions.

A10 - Magnetosphere-Ionosphere Interactions

Conveners: David Knudsen (Canada)

Co-convenors: Lasse Clausen (Norway), Colin Forsyth (UK), Larry Kepko (USA)

Description

While the magnetosphere is appropriately viewed as the dominant supplier of energy to the coupled M-I system, the ionosphere plays an important role is an active load in the closure of field-aligned currents, the dissipation of particle energy and Poynting flux, and as a source of cold plasma and “heavy” ions (O+, N+ and molecular) for the magnetosphere, among others. Furthermore, the ionosphere-thermosphere dynamo can sometimes prevail over magnetospheric energy inputs. In the past, advanced ionospheric models have typically used overly simplified magnetospheric inputs, while magnetospheric models have treated the ionosphere as a uniformly conducting layer. Recently models of the magnetosphere have begun to include increasingly sophisticated representations of the ionospheric boundary, and are addressing complex behaviours of the coupled M-I system at increasingly smaller scales in both space and time, including: convection, FAC production and closure, connection to the ring current and inner magnetosphere, streamers, BBFs, reconnection, substorms, and more. Similarly, models of ionospheric electrodynamics, transport and chemistry also continue to advance. Given a time history of solar wind inputs, global models can now reproduce geomagnetic indices and large-scale behaviour of the M-I system with surprising accuracy, though not yet consistently. Furthermore, accurate representations of smaller-scale phenomena remain elusive, including for example discrete auroral arcs, for which the fundamental generation mechanisms remain unknown. This symposium will cover recent progress in understanding of the coupled magnetosphere-ionosphere system based on observations, simulations and theory.

A11 - MAGNETIC FLUX ROPES FROM THE SUN TO GEOSPACE

Convener: Mark Linton (USA)

Co-Conveners: Sarah Gibson (USA), Emilia Kilpua (Finland)

Invited speakers: Anthony Yeates (England), Shinsuke Takasao (Japan), Jonathan Eastwood (England)

Description

Magnetic fields play a prominent role in driving solar activity and space weather from Sun to Earth. When these magnetic fields are twisted around a common axis to form magnetic flux ropes, this gives them a coherent, self-confining structure, and allows them to store energy and act as a single unit. This coherence is often invoked as a reason why bundles of magnetic flux can rise buoyantly to the solar surface to form active regions without breaking up long before they reach the surface. This coherence has also been proposed as a means for storing eruptive capacity in coronal magnetic fields, and then driving solar eruptions such as flares and coronal mass ejections (CMEs). The current consensus is that CMEs contain a magnetic flux rope at their core as they leave the Sun, independent of whether this flux rope is pre-existing or forms during the eruption. This underlying flux rope structure is used to explain the commonly observed coherence of CMEs when observed in the outer corona. As interplanetary CMEs pass over spacecraft in the heliosphere, they still often display this coherence, and corresponding evidence of twisted magnetic field structure. Flux ropes are also believed to form both at magnetopauses and in magnetotails as a consequence of the solar wind magnetic field interacting with planetary magnetospheres, and they play a key role in the transmission of mass energy and momentum within magnetospheres. In this symposium, we will explore these various phases of flux rope formation and evolution from the Sun to Geospace and planetary space environments, and we will explore ways in which a better understanding of this behavior can lead to improved insights into solar activity and space weather.

A12 - Quiet Sun, Active Regions and Coronal Holes (DIV IV)

Convener: Gregory D. Fleishman (USA)

Co-Conveners: Sven Wedemeyer (Norway), Donald M. Hassler (USA), Kleint Lucia (Switzerland)

Description

Solar observations and state-of-the-art 3D MHD simulations during the recent years have significantly advanced our understanding of the structure and dynamics of the quiet Sun, coronal holes, and active regions down to very small spatial and temporal scales. The goal of this symposium is to bring together researches from various sub-areas to envision a bigger synthetic picture. The emphasis of the symposium will be given to new multi-wave observations in decimeter, microwave, millimeter, sub-millimeter, infrared, optical, UV and X-ray bands together with state-of-the-art simulation and modeling (MHD, NLFFF, coronal heating).

A13 - Multi-Spectral Studies of Solar Activity and Eruptions

Convener: Gregory Fleishman (USA)

Co-Conveners: Marina Battaglia (Switzerland), Manuela Temmer (Austria), Frederic Effenberger (Germany), Lucia Kleint (Switzerland)

Description

Solar flares and Coronal Mass Ejections are often viewed as the most energetic and powerful magnetic explosions in the solar system.Despite of the substantial progress made over the last few decades in understanding the physics of the solar eruptions, there are many open questions. Over the last few years, the unprecedented variety of the spacecraft and ground based observations of solar flares become available: from the high energy gamma and X-ray emission, through UV/optical range down to radio frequencies. The symposium aims to bring together the diverse solar flare community to discuss the latest observations, modelling and theoretical developments in the area of solar flare physics. It will focus on correlative analysis of simultaneous multi-spectral observations of solar flare phenomena addressing the key science questions of magnetic energy release, energetic particle acceleration and transport, the response and emissions in the solar atmosphere and the heliosphere. In addition, the connection of the observational results with the modelling and theoretical developments in this area will be discussed.

A14 - Advances and Upcoming Developments in Solar and Heliospheric Physics

Convener: Mari Paz Miralles (USA)

Co-Conveners: Ada Carbonell (Norway), Jin-Yi Lee (Korea), Xochitl Blanco Cano (Mexico), Merav Opher (USA), John Richardson (USA), Jana Safrankova (Czech Republic), Roelf Du Toit Strauss (South Africa), Stefano Livi (USA).

Description

Continuous observations have advanced our knowledge of the physical and dynamical properties of the Sun, the heliosphere, and the interstellar medium. These observations, along with theory and models, continue to pose challenges to our understanding of the relevant physical processes. This symposium invites contributions covering new results from space- and ground-based observations, theory, and modeling of different aspects of the Sun and the heliosphere, including the solar interior, magnetic field, atmosphere, solar wind, and interstellar medium. This symposium will stimulate exchange and promote discussion of upcoming developments from the latest research and instrumentation in the field.

A15 - Waves and Turbulence in the Solar Corona and Wind

Convener: Valery M Nakariakov (UK)

Co-Conveners: Giuseppe Nistico (Germany), Olga Alexandrova (France), Bogdan Hnat (UK), Yong-Jae Moon (Korea)

Description

Waves and turbulence in the solar corona and solar wind are a critical topic on both theoretical and observational grounds. Remote-sensing observations have recently revealed magnetohydrodynamic (MHD) waves in the solar corona. Meanwhile, sophisticated numerical MHD simulations become available that shed light on how these waves are generated and dissipated, as well as the possible role of kinetic effects. Solar wind turbulence in interplanetary space remains a hot topic, with remarkable observational and theoretical progresses in terms of wave-vector anisotropy, nature of turbulence at kinetic scales, intermittent heating, and so on. Solar wind models are also improved to incorporate important effects of wave and turbulence. In this symposium, we solicit contributions on both the observational analysis and theoretical modelling of waves and turbulence in the solar corona and wind. We look forward to get a comprehensive overview of what we have known about waves and turbulence in this context, and discuss recent results and anticipated future breakthroughs.

A16 - Geomagnetic Observations for Earth and Space Science and for Space Weather Applications

Convener: Ellen Clarke (UK)

Co-Conveners: Stefan Lotz (South Africa), Antti Pulkkinen (USA)

Invited Speakers: Chris Balch (USA), David Boteler ( Canada), Mervyn Freeman ( UK)

Description

Space weather research continues to be essential because of the potentially hazardous effects on both space-borne and ground-based technological systems. Our current understanding of the various complex physical links associated with Earth-directed solar activity and resultant geomagnetic storms is incomplete. Measurements of the Earth’s magnetic field are a vital resource for studies that will improve this understanding. These include measurements on the ground from fixed long running observatories and shorter term variometer stations, which provide both excellent temporal resolution and spatial coverage, when considered collectively as networks. Measurements can also be made by satellites in space, providing even better spatial resolution. Investigations that can be undertaken with these data range from: modelling of solar wind/magnetospheric/ionospheric interactions and coupling mechanisms; modelling and measurement of resultant electromagnetic induction in the Earth; detailed local disturbances and effects on specific infrastructure (e.g. geomagnetically induced currents); global disturbances, including longer term climatological variations; and their effects (e.g. on satellite orbit control), to name just a few.

This Symposium aims to bring together researchers who make use of the geomagnetic data and data products with those involved in provision of the observations. We welcome contributions demonstrating new and innovative uses of geomagnetic observations and products, either on their own or in combination with other data or models, such as, for example, data and models of the solar wind and the magnetosphere. We particularly encourage contributions on large geomagnetic disturbances and their effects on infrastructure by means of statistical analysis, modelling, predictions and mitigation of such space weather effects. As well as the use of geomagnetic data, we encourage reporting of studies that address the modern-day challenge of moving our scientific understanding of space weather hazards forward, ultimately with the aim of providing relevant and timely information to industry.

A17 - Geomagnetic Observatories: Current Developments and integration into Multidisciplinary Earth Observation Networks

Convener: Achim Morschhauser (Germany)

Co-Conveners: Alexandre Gonsette (Belgium), Andrew Lewis (Australia)

Description

Geomagnetic observatories are known for their stability and continuity. One of the reasons is that changes are only introduced after thorough testing. Nevertheless, modern hardware and software can significantly improve data acquisition, processing, and distribution. We invite contributions that present innovative developments such as, for example, real-time data, one-second data, or community-based software.

A particular aspect of data distribution are Earth observation networks such as the World Data System, INTERMAGNET, or the European Plate Observing System, and we also invite contributions that focus on integrating geomagnetic data into such networks, but also into applications and connection with industry.

A18 - Dependable, Long-Term Geomagnetic Indices and Modern, Index-Based Services: 70th Anniversary Of the Kp Index

Convener: Jürgen Matzka (Germany)

Co-Conveners: Anatoly Soloviev (Russia), Jeff Love (USA)

Invited speakers: Simon Wing (USA), Trey Cade (USA), Irina Zhelavskaya (Germany)

Description

70 year ago, in 1949, Julius Bartels introduced the geomagnetic Kp index. This symposium is dedicated to the production, prediction and application of geomagnetic indices.

These indices, derived from geomagnetic observations, quantify phenomena like the energy transfer from the solar wind or the strength of the ring current. They are used as space weather indicators and as input for empirical models of the space environment. Due to their long-term stability they can be used to quantify space climate. Next to the established IAGA-endorsed geomagnetic indices there also exist researcher-driven indices to address specific scientific questions.

A19 - Space Weather & Ground Observations: Geomagnetic Induced Currents and Corresponding Regional Conductivity Models of the Earth's Lithosphere

Convener: Malcolm Ingham (New Zealand)

Co-Conveners: Anna Kelbert (USA), Alexey Kuvshinov (Switzerland)

Description

Geomagnetic Induced Currents (GIC) caused by space weather present an increasing risk to modern technological systems. The severity of risk depends on many factors including the magnitude and duration of a geomagnetic disturbance, the topology of the infrastructure, and the local and regional earth conductivity structure.

We invite presentations covering all aspects of the study of GIC: measurements of GIC in power and pipeline systems, the impact upon GIC of lithospheric conductivity structure, modelling and forecasting of GIC, and mitigation of the impact of GIC.

A20 - Geophysical Survey Technology for Mining Exploration

Conveners: Richard Smith (Canada), Ian Ferguson (Canada)

Description

We invite presentations covering all aspects of geophysical technology applied in mineral exploration and mining. The technology can range across differing geophysical equipment, processing methods, modelling and inversion techniques, interpretation approaches, and types of mineralization. Presentations can be focused on one technique or discuss methods for integrating multiple data sets, using for example machine learning algorithms.

Submissions can relate to work done at a multitude of scales. At the continental scale, the geophysical techniques could be defining crustal and sub-continental lithospheric mantle structures that might focus mineralizing fluids. At the mining camp scale the techniques might be delineating large alteration zones that are associated with many types of deposits; at the scale of hundreds of metres the techniques might be exploring for a new deposit. At the scale of tens of metres, the technique might be looking for new lenses of mineralization and, at the scale of a few centimetres, the techniques could be for examining the physical properties that help in understanding geological variation.

We welcome examples that are successful or unsuccessful.

A21 - Advances in EMI theory: Data Processing, Modelling and Inversions

Conveners: Mark Everett (USA), Alexander Grayver (Switzerland)

Invited speakers: Lindsey Heagy (Canada), Benjamin Murphy (USA)

Description

The electromagnetic induction method in geophysics provides a powerful method of probing Earth's electrical conductivity structure across an enormous range of spatial scales from 100 to 107 m. Global-scale studies utilize magnetospheric, ionospheric, and tidal sources to probe the large-scale structure of Earth's crust and upper mantle. Regional scale studies based on magnetotellurics are used to better understand continental dynamics, the ocean basins, and tectonic processes. At the exploration scale, both passive and controlled sources are used to delineate energy, mineral and water resources. In the near-surface, controlled-sources explore critical zone processes and characterize a wide variety of anthropogenic targets. The complexity of geological structures coupled with the wide spectrum of coherent and incoherent noise, along with the fundamental ill-posedness of model reconstruction, together generate an electromagnetic response that becomes a computational heavy and major scientific challenge to correctly interpret. These complexities continue to drive improvements in algorithms and methodology. This wide-ranging IUGG session is devoted to presentations and discussions of recent advancements in processing, modelling and inversions of EMI responses along with the enhanced interpretation of Earth's electrical conductivity structure that the new methods have enabled.

A22 - Significant Achievements in Magnetic Field Studies Induced by IUGG over Its 100-Year History

Conveners: Justin Mabie (USA), Roman Krasnoperov (Russia)

Description

In 2019 IUGG celebrates its centenary and geomagnetism is one of the oldest geoscience disciplines, which has been of constant scientific interest for the IUGG ever since its formation. The symposium aims to discuss the recognized scientific milestones in geomagnetism and prominent IUGG figures behind, through its history. It will also include modern issues and developments that determine the role of geomagnetism among other geosciences. We encourage specialists in history of science and researchers who are interested in the legacy of IAGA to participate. Materials reviewing the most significant books, newspapers, magnetic charts and other historical sources as the integral part of geomagnetic studies are welcome.

JOINT SYMPOSIA WITH OTHER ASSOCIATIONS LED BY IAGA

JA01 - Geophysical Constraints on the Earth's Core and Its Relation to the Mantle (IAGA, IASPEI, IAG)

Convener: Jon Aurnou (USA, IAG)

Co-Conveners: Michael Bergman (USA, IAG), Carla Braitenberg (Italy, IAG), George Helffrich (Japan, IASPEI), Tine Thomas (Germany, IASPEI)

Description

This symposium seeks contributions covering from core to mantle, including observations, material properties, structure and dynamics. In the mantle, composition, rheology, density, electric and magnetic properties are required to define the dynamical evolutionary path through space-time. The recent satellite missions GRACE, GOCE and SWARM, and novel teleseismic methods give new insights into deep Earth physical properties and state. Models of mantle convection and the interaction with lithospheric plates and subducted relics use these data as input to define the models in greater detail. Geodetic and seismic data provide inputs necessary for constraining possible stable layers in the outer core, with high resolution models of the geomagnetic field required to make further progress in our understanding of core dynamics and dynamo generation. Seismology and mineral physics continue to work in tandem to further our understanding of inner core structure and dynamics. We also welcome studies concerning global-scale coupling, including the dynamical interaction between the inner, outer core, the mantle and earth rotation.

> U05
JA02 - Geophysical Data Assimilation (IAGA, IACS, IAG, IAHS, IAMAS, IAPSO, IASPEI, IAVCEI)

Convener: Sabrina Sanchez (Germany, IAGA)

Co-Conveners: Marie Bocher (Switzerland, IASPEI), Matthias Morzfeld (USA, IAGA/IAMAS), Takemasa Miyoshi (Japan, IAMAS), Entcho Demirov (Canada, IAPSO), Julien Brajard (France, IAPSO/IACS), Salvatore Grimaldi (Italy, IAHS), Pavel Novak (Czech Republic, IAG),
Alessandro Bonforte (Italy, IAVCEI)

Description

Data assimilation has become a valuable tool for improving our understanding of the Earth and its different dynamical layers, such as the core, mantle, oceans, atmosphere and magnetosphere. By merging sparse observations, complex physical models and their respective errors, data assimilation attempts to unveil hidden features of a given system as well as predicting its evolution. Although its long-term development in the field of meteorology has led to a well-established framework, data assimilation methodologies still bear considerable challenges. Amongst those we can cite the numerical stability of ensemble-based methods such as the Ensemble Kalman Filter, the identification and handling of model errors and biases, the hybridization of variational and sequential approaches, and the usage of multi-model ensembles for parameter estimation. Moreover, in many fields of application, such as core and mantle dynamics, as well as volcanism and space weather, data assimilation remains fairly exploratory. However, these novel applications can provide a platform for further analysis of the aforementioned challenges. This symposium aims at promoting a constructive dialogue between the different geophysical communities with a shared interest in the development of innovative strategies in data assimilation. We therefore particularly encourage the participation of contributions connected to emerging research fields of geophysical data assimilation, as well as the development of libraries, testbeds and computationally efficient data assimilation schemes.

> U03
JA03 - Geophysical Records of Tectonic and Geodynamic Processes (IAGA, IASPEI, IAG, IAVCEI)
Convener: Fernando Poblete (Chile, IAGA)

Co-Conveners: Leonardo Sagnotti (Italy, IAGA), Matthias Morzfeld (USA, IAGA/IAMAS), Marie Bocher (Switzerland, IASPEI), Haluk Ozener (Turkey, IAG)

Description

This symposium aims to bring together a wide range of investigations related to paleomagnetism, magnetic anisotropy, gravimetry, seismic, volcanologic and other geophysical studies intended to unveil tectonic and geodynamic processes at different scales and their links to Earth Dynamics. Thus, presentations may include:
- Characterization of subsurface structures and implications in tectonic evolution
- Tectonic evolution of subduction related orogens
- Geodynamic processes in a collisional setting
- Geodynamic processes at convergent/divergent plate margins
- Plate kinematics
JA04 - Global Electrodynamics and Energetics of Atmospheric Regions from Ground to Space (IAGA, IAMAS)

Convener: Irina Mironova (Russia, IAGA) and Colin Price (Israel, IAMAS)

Co-Conveners: Martin Fullekrug (UK, IAGA), Earle Williams (USA, IAGA) and Eugene Rozanov (Switzerland, IAMAS)

Description

The global atmospheric electric circuit (GEC) comprises the thunderstorm activity maintaining a time-varying, globally-uniform electrical potential difference between the ionosphere and the Earth as well as downward electric currents in the fair weather regions. The strength of the currents depends on the atmospheric conductivity and ionization produced mostly by galactic cosmic rays. The atmospheric electric field can be measured near the ground at different geographical locations, in particular in pristine atmosphere over Antarctic. The other powerful electrodynamic phenomena related to the intense lightening discharges and the transient luminous events (TLE) are observed by modern satellite-based instruments. The GEC variability is believed to affect cloud properties and modulate the atmospheric state.

The symposium solicits contributions which may advance our knowledge in all areas related to ionospheric potential, electrical currents, TLE, lightning physics, energetic radiation, energetic particles, and their impact on the Earth's atmosphere, ionosphere and the magnetosphere.

Interdisciplinary studies which emphasize the electrodynamic connection between atmospheric layers, meteorological effects of GEC and possible impact to the climate change are particularly welcome.
JA05 - Solar Influence on the Atmosphere (IAGA, IAMAS)

Convener: Christoph Jacobi (Germany, IAGA)

Co-Conveners: Katja Matthes (Germany, IAGA/IAMAS), Nicholas Pedatella (USA, IAGA), Peter Pilewskie (USA, IAMAS), Joanna Haigh (UK, IAMAS)

Invited speakers: Hiuxin Liu (Japan), Dimitry Pokhotelov (Germany), Margit Haberreiter (Switzerland)

Description

Solar influence on climate keeps attracting much interest presently. This includes in particular the role of the Sun both in the past climate as in future climate variability as an important aspect. State-of the art climate models include a well resolved stratosphere and partly mesosphere. This allows the prediction of global climate and its changes taking into account expected solar related variability at short to long time scales.
JA06 - Space Weather Throughout the Solar System: Bringing Data and Models Together (IAGA, IAMAS, IAG)

Convener: Enrico Camporeale (Netherlands, IAGA)

Co-Conveners: Sarah Gibson (USA, IAGA), Kyung-Suk Cho (Korea, IAGA), Giuseppe Consolini (Italy, IAGA), Christina Plainaki (Italy, IAGA), Donald Hassler (USA, IAMAS), Earle Williams (USA, IAMAS), Klaus Börger (Germany, IAG)

Description

We encourage contributions pertaining to recent progress in the effective incorporation of data into space weather modeling and prediction at any point along the chain from sun to planets. Moreover, we welcome approaches that are less traditional in the space weather community but possess potential for significant progress in forecasting and understanding space weather, and that draw upon "lessons learned" or "best practices" from applications to non-space-weather problems.
JA07 - Geoscience Data Licensing, Production, Publication, and Citation (IAGA, IACS, IAG, IAHS, IAMAS, IAPSO, IASPEI, IAVCEI)

Convener: Masahito Nosé (Japan, IAGA)

Co-Conveners: Simon Flower (UK, IAGA), Yasuhiro Murayama (Japan, IAMAS), Helle Pedersen (France, IASPEI), Attilio Castellarin (Italy, IAHS), Gabriel Guimarães (Brazil, IAG), Toru Suzuki (Japan, IAPSO), Aude Chambodut (France, UCDI), Giuseppe Puglisi (Italy, IAVCEI)

Description

A number of national and international geoscience research infrastructures have been created in recent years, for example, EPOS (the European Plate Observing System), Copernicus (European Union's Earth Observation Programme), IUGONET (the Inter-university upper atmosphere global observation network), EarthCube (the ‘system of systems’ infrastructure for geosciences) and AuScope (the Autralian geoscience and geospatial infrastructure). At the same time the World Data System is evolving and certification of data repositories (ICSU-WDS, CoreTrustSeal) is becoming an important concern. Together these initiatives make it possible for users to easily access huge archives of disparate geoscience data and metadata in a secure and reliable manner, a task that was complex and time consuming before these initiatives were available.

Clear licensing of geoscience data gives users clarity over how they can use and share the data, protects the rights of data providers and promotes integrated research. Data publication and citation will benefit data suppliers by giving them proper credit, professional recognition and rewards for their works, in a similar manner to the way that publication of scientific results benefits scientific researchers. Licensing, publication and citation of data are becoming a requirement for contribution to geoscience infrastructures. The system of licensing, producing, publishing, and citing of geoscience data is a structure for persistent intellectual content identification and management as well as for connection of users with content suppliers.

This symposium solicits contributions presenting actual practices and future plans of data licensing, producing, publication, and citation of scientific data, and possible related topics.
JA08 - Probing the Earth’s Lithosphere and Its Dynamics Using Geophysical Modeling (IAGA, IASPEI, IAVCEI, IAG)

Convener: Foteini Vervelidou (Germany, IAGA)

Co-Conveners: Stavros Kotsiaros (USA, IAGA), Robert Tenzer (Hong Hong, IAG), Jörg Ebbing (Germany, IAG/IAGA), Rob Govers (Netherlands, IASPEI/IAG), Javier Fullea (Ireland, IASPEI), Magdalena Scheck-Wenderoth (Germany, ILP), Silvia Massaro (Italia, IAVCEI)

Description

This symposium focuses on the structure and dynamics of the Earth’s lithosphere. Multiple geophysical observations help us probe the Earth’s lithospheric structure and understand its dynamic behavior. These include the magnetic and gravity field, electromagnetic induction, heat flow and seismological data.

The lithospheric magnetic field reflects properties like composition and temperature and carries information about tectonic, chemical, and thermal alterations that magnetized rocks have undergone throughout their history. Gravity field, apart from information on composition, reveals information about mass exchange mechanisms related to dynamic processes like sea level rise, glacial retreat, and lithospheric flexure. Magnetotelluric studies image Earth’s electrical conductivity from the near-surface to deep within the mantle. Seismological methods including receiver functions map the location of major interfaces like the Moho and the Lithosphere-Asthenosphere Boundary. Seismic velocities can be inverted for density and temperature, and seismic attenuation and seismic anisotropy are correlated with temperature and strain, respectively. Global heat flow measurements help constrain the lithospheric geotherm and Earth’s energy budget. These geophysical data sets provide us with a highly valuable data pool for the study of the Earth’s lithosphere and its mechanical strength.

We solicit contributions focused on any related geophysical data set or combinations of them with the ultimate goal of enhancing our knowledge about the structure, composition and dynamics of the Earth’s crust and uppermost mantle. In this respect, we welcome contributions from studies focusing on data collection and processing, global or regional modeling and interpretation of data and models in terms of tectonic, geological or geophysical implications.

> U04
JA09 - Joint Inversion of Different Geophysical Data Sets (IAGA, IASPEI)

Convener: Alan Jones (Canada, IAGA)

Co-Conveners: Max Moorkamp (UK, IAGA), Juan Carlos Afonso (Australia, IASPEI), Jan Dettmer (Canada, IASPEI)

Description

Combining complimentary data sets typically reduces the ambiguity of inversion results and facilitates subsequent interpretation. Hence, integration of multi-disciplinary data has become popular in many disciplines including hydrogeophysics, mineral exploration, sub-basalt and sub-salt problems, gas hydrate investigations, and studies involving deep crustal and mantle structures. Still, many questions remain: Which types of data should be inverted together? How to balance their influence in the inversion? How can we assess the differences between joint inversion, cooperative inversion and other integrated interpretation strategies?

This symposium welcomes research using joint inversion or other approaches to combine different types of geophysical data. Both case studies and technical contributions are welcome

> U03
JA10 - Electromagnetic Signals Generated by Volcanic Eruptions/Activity, Fluid Pressure, Earthquakes and Aseismic Fault Slip (IAGA, IAVCEI, IASPEI)

Convener: Jacques Zlotnicki (France, IAGA)

Co-Conveners: Malcolm Johnston (USA, IAGA/IASPEI), Takeshi Hashimoto (Japan, IASPEI/IAVCEI), Xuhui Shen (China, IASPEI), Yoichi Sasai (Japan, IAVCEI)

Description

Changes in inter-related crustal stress, deformation, pressure/temperature of electrically conducting fluids and pore pressure in crustal rocks all occur in both volcanic regions and regions of seismic and aseismic fault failure. All these processes generate electric and magnetic (EM) fields. Furthermore, global EM effects are observed in the atmosphere and ionosphere with explosive ash eruptions. While co-eruptive effects and co-seismic fault failure effects in EM fields, deformation, seismicity and geochemistry are readily observed and modeled, the inter-relation between various parameters during periods of volcanic unrest and aseismic activity that are driven by perhaps the same underlying physics is much less clear. This symposium focuses on bringing together examples of multi-parameter land and satellite observations during volcanic activity and earthquake rupture (Part 1), non-eruptive volcanic activity (Part 2) and aseismic fault activity (Part 3) in order to identify the dominant but perhaps changing physical processes involved. Knowledge of the non-uniform EM tomography of volcanoes and fault systems is a necessary prerequisite for modeling these different processes.
JA11 - Cratonic Structure and Dynamics (IAGA, IASPEI)

Convener: Nikolay Palshin (Russia, IAGA)

Co-Conveners: Ute Weckmann (Germany, IAGA), Sergei Lebedev (Ireland, IASPEI), Irina Artemieva (Denmark, ILP)

Description

Cratons record a long history of tectonic events. The result is a complex, stable collage of lithosphere fragments that can continue, however, to experience deformation and modification. Understanding the evolution, composition and structure of cratons remains a challenge, which includes the details of accretion and orogenesis, the roles of inherited structures and lithosphere thinning in past and ongoing deformation, and the mechanisms of craton construction, modification and stabilization.

This symposium seeks contributions that address structure, composition, evolution and the dynamic processes that have shaped cratonic lithosphere based on a range of approaches, including seismology and electromagnetic methods and other geophysical methods; geochemistry, petrophysics and geodynamic modelling. We particularly welcome integrated geophysical imaging techniques that cross disciplinary boundaries and those that link lithosphere dynamics with processes occurring at the Earth’s surface and the deeper mantle.
JA12 - Innovation in Geoscience Education, Outreach and Citizen Science (IAGA, IAHS, IAPSO, IASPEI)

Convener: Manoj Nair (USA, IAGA)

Co-Conveners: Rick Saltus (USA, IAGA), Edgar Bering (USA, IAGA), Barbara Leichter (Austria, IAGA), Christophe Cudennec (France, IAHS), Isabelle Ansorge (South Africa, IAPSO), Laura Gallardo (Chile, IAMAS), Raju Sarkar (Bhutan, IASPEI), Paul Denton (UK, IASPEI), John Taber (USA, IASPEI),

Description

This Symposium calls for papers describing innovations in geoscience instruction methods and citizen science initiatives. Papers are welcome describing advances in all levels of instruction, including secondary and higher education. We are particularly interested in papers about inventive approaches to inquiry-based learning in all geosciences. Involving students and the public in designing experiments and collecting data has been shown to foster a scientific identity, to increase overall interest in science, and to improve the perceived value of scientific research. Papers are welcome on all aspects of education and citizen-science including methodology, data-collection, non-traditional areas of curriculum, case studies, etc. In particular we invite contributions that describe ways to broaden the public understanding and appreciation of science and to attract non-traditional and under-represented students into the sciences.

OTHER IAGA JOINT SYMPOSIA WITH OTHER ASSOCIATIONS LEADING

JG02 - Theory and Methods of Potential Fields (IAG, IAGA)

Convener: Dimitrios Tsoulis (Greece, IAG)

Co-Conveners: Sten Claessens (Australia, IAG), Maurizio Fedi (Italy, IAGA)

Description

Heterogeneous datasets of increasing spatial resolution, describing the shape and structure of the Earth and other celestial bodies, are currently available, as well as their gravity and magnetic fields at different scales, from near to the surface to satellite altitudes. This brings about new developments in the theory and methods of potential fields. Densely sampled Digital Elevation Models, global crustal models and the abundance of potential field models, now beyond degree and order 5480, provide a dynamic framework for revisiting and updating the methodological apparatus dealing with the theoretical and numerical aspects of potential functions and of their spatial derivatives. The symposium welcomes contributions falling into this topic and deal with new theoretical or methodological advances in potential fields. Terrain modeling and reductions at all spatial scales, spherical harmonic analysis and synthesis, spheroidal and ellipsoidal harmonics, ultra-high degree/order expansions, and analytical, numerical and multiresolution techniques in potential field modeling are some of the encouraged keywords. Also welcomed are contributions about the interpretation/inversion of potential fields and their ability to reconstruct the sources of the anomalies.
JG05 - Remote Sensing and Modelling of the Atmosphere (IAG, IAGA, IAMAS, IAVCEI )
Convener: Michael Schmidt (Germany, IAG)

Co-Conveners: Lung-Chih Tsa (Taiwan, IAG), Robert Heinkelmann (Germany, IAG), Claudia Stubenrauch (France, IAMAS), Veronika Barta (Hungary, IAGA), Arnau Folch (Spain, IAVCEI)

Description

Satellite observations provide a continuous survey of our planet’s surrounding atmosphere, which is structured into distinct layers, according to e.g. temperature or charge state.

Ionosphere, plasmasphere and thermosphere are manifestations of space weather; its impacts and risks are gaining more and more importance in politics and sciences, since our modern society is highly depending on space-borne techniques, e.g. for communication and positioning.

Stratosphere and troposphere and their constituents are essential for life on our planet, and tropospheric water vapour is source of clouds and of precipitation, which in turn affect the large-scale circulation through heat transfer. The synergistic use of different instruments and modelling is leading to major advances in the understanding of our climate.

This symposium invites contributions on advances in observing and understanding our atmosphere – from troposphere to magnetosphere. Specific topics are:
- (near) real-time approaches to monitor and forecast the ionospheric state
- combination of various observation techniques and improvement of the representation of atmospheric key parameters
- interaction between atmospheric layers and Global Navigation Satellite System reflectometry
- studies on space weather research and coupling processes in the upper atmosphere
- studies on empirical atmosphere models, e.g. for the upper atmosphere, and numerical weather models
- aerosol, cloud and radiation processes and interactions in the climate system
- use of synergetic satellite observations and modelling for a better understanding of cloud processes and feedbacks
JG07 - Monitoring, Imaging and Mapping of Volcanic Belts (IAG, IAGA, IASPEI, IAVCEI)

Convener: José Fernardez (Spain, IAG)

Co-Conveners: Patrick Whelley (USA, IAVCEI), Mark Bebbington (New Zealand, IAVCEI), Jacob Richardson (USA, IAVCEI), Martyn Unsworth (Canada, IAGA), Philippe Jousset (Germany, IASPEI), Simone Cesca (Germany, IASPEI)

Description

A range of important geological processes occur beneath volcanic belts. Subsurface fluxes of magma and hydrothermal fluids have generated both the continental and oceanic crust and formed many mineral deposits. However, the crustal structure of volcanic belts is not fully understood. This symposium seeks to advance this research area by gathering researchers studying the subsurface structure of active volcanic systems. We welcome all contributions that present (a) geophysical studies of volcanic belts and (b) geological studies that seek to interpret geophysical models in terms of laboratory experiments, (c) Geodetic measurements, imaging and topography of volcanic belts, and (d) multidisciplinary studies on volcanic belts.
JS02 - Early Warning Systems for Geohazards (IASPEI, IAG, IAGA)

Convener: Massimiliano Pittore (Germany, IASPEI)

Co-Conveners: Aldo Zollo (Italy, IASPEI), David McCormack (Canada, IASPEI), John LaBrecque (USA, IAG), Alan Thomson (UK, IAGA)

Description

Damaging phenomena related to a variety of geo-hazards constantly threaten people, the built environment and its vulnerable infrastructure on a global scale. These phenomena depend on the type of underlying geologic process and may unfold across different spatial and temporal scales. The increasing urbanization and subsequent socio-economic development continuously raise the bar for the Civil Protection authorities and decision makers striving to control and reduce the associated risk. The development of Early Warning systems has been often proposed as a technological solution for mitigating the impact of geo-hazards. The development and implementation of such systems depends on understanding, modelling and monitoring the underlying natural processes.

The Symposium aims at bringing together scholars and practitioners with mutual interest in modelling, computational and experimental methods and technological advances from the design to the practical implementation of early warning systems for a broad range of geo-hazards. The symposium encourages original research, benchmark studies and practical examples with particular emphasis on open questions, unsolved issues and societal impact. The overall goal is to foster a holistic, multi-disciplinary discussion addressing the key challenges for the design and development of next generation early warning systems in the context of the 2015-2030 Sendai Framework for Disaster Risk Reduction.

Topics of interest include but are not limited to: Multi-source real-time data collection, sensors fusion; dynamic, evolutionary process modelling; decision-making strategies; rapid response and performance-driven approaches; from forecasting to nowcasting to early warning; industrial and mission-critical applications; (Near) real-time risk mitigation; Cost-benefit analysis and socio-economic impact; practical case studies.

> U02
JS06 - Old Data for New Knowledge: Preservation and Utilization of Historical Data in the Geosciences (IASPEI, IAG, IAHS, IAGA, IAMAS, IACS, IAPSO, IAVCEI)

Convener: Josep Batlló Ortiz (Spain, IASPEI)

Co-Conveners: Alberto Viglione (Austria, IAHS), József Ádám (Hungary, IAG), Edward Cliver (USA, IAGA), Kris Harper (USA, IAMAS), Bruce Raup (USA, IACS), Florence Fetterer (USA, IACS), E. Pattabhi Rama Rao (India, IAPSO), Roberto Carniel (Italy, IAVCEI)

Description

Studying a changing world needs long series of data. Moreover, reanalysis of old geophysical/geodetic data in the light of our present knowledge has become an important tool for understanding topics such as solar variability, climatic change, tectonics, earth rotation, and extreme natural events (e.g., magnetic storms, hurricanes, rainfall, floods, earthquakes etc.). Those old data are in analogue form and, many times, are contained in unique documents. Historical information may also be retrieved from documentary evidence such as narrative sources and legal-administrative institutional documentation (e.g. chronicles, newspapers, private and official protocols and correspondence, account books, etc.). Techniques and methodologies for preservation, dissemination, interpretation, homogenisation and use of such data, as well as for their present scientific use are important topics for advancing of our understanding of the changing Earth and of past extreme events. Different approaches have been devised to deal with different data and problems. Sharing the already large accumulated experience in the different fields covered by the IUGG shall contribute to improve our preservation and dissemination tools, our analysis methods and, ultimately, to further research results. This symposium welcomes contributions on:

(a) Locating, assessing, preserving, and disseminating historical data about sunspots, polar motion, time and temperature measurements, magnetograms, seismograms, eruptions, glacier extent, tide gauge records, aurorae, flood/drought events and many others and

(b) Methodologies and study cases using these historical data to advance our understanding of the Earth.

> U04

> U07
JS09 - Tectonophysics of the Continental Lithosphere: Integrating the Thermal Field with Thermo-Barometric, Seismological, Electromagnetic and Seismicity Data (IASPEI, IAVCEI, IAGA)

Convener: Andrea Förster (Germany, IASPEI)

Co-Conveners: Rainer Kind (Germany, IASPEI), Alan Jones (Canada, IAGA), Gianluca Gola (Italy, IAVCEI)

Description

Geotherms are fundamental for the quantification of the Earth’s thermal structure and the understanding of tectonophysical processes. They are numerical models that require a sound understanding of surface heat flow, and sensu stricto terrestrial heat flow, rock thermal conductivity (which is pressure and temperature dependent) and radiogenic heat production. For stabilized crust, known values of mantle heat flow can help to constrain those thermal properties of the crust. The ambiguity of the lithospheric thermal regime is large owing to uncertainties in the quantification of the governing parameters, for example the lithosphere structure and composition and the lithosphere-asthenosphere depth.

Uncertainties also arise from the different laboratory measurements deployed in constraining the heat flow and rock thermal properties. Other problems are linked with transient thermal processes not depicted yet by surface heat flow. It is therefore desirably to seek for independent evidence to verify the thermalfield, which is e.g. by xenolith-derived thermo-barometry data, data on the cut- off depth of earthquakes, by seismology and electromagnetic surveys. We therefore welcome papers that address an integration of the thermal field with geophysical imaging techniques to answer fundamental questions in rheology and geomechanics, and young geodynamic processes.