International Association of Geomagnetism and Aeronomy (IAGA)


Internal Magnetic Fields

Chairman: Sven-Erik Hjelt, Department of Geophysics, Institute of Geosciences and Astronomy, University of Oulu, P.O. Box 333, FIN-90571 Oulu 57 (Finland); tel: +358-81-553-1401; fax: +358-81-553-1414; telex: 32375/OYLIN SF.


Aeronomic Phenomena

Chairman: Arthur D. Richmond, NCAR-HAO, P.O. Box 3000, Boulder, CO 80307-3000 (USA); tel: 1-303-497-1570; fax: 1-303-497-1589.


Magnetospheric Phenomena

Chairman: S. W. H. Cowley, Space and Atmospheric Physics, Imperial College of Science, Technology and Medicine, The Blackett Laboratory, Imperial College, London SW7 2BZ (UK); tel: +44-71-594-7773; fax: +44-71-594-7772; telex: 929484 IMPCOL G


Solar Wind and Interplanetary Field

Chairman: Stanislaw Grzedzielski (COSPAR) 51 Bd de Montmorency, 75016 Paris, (France); tel: +33-1-4525-0679; fax: +33-1-4050-9827; telex: 645554 /ICSU F.


Observatories, Instruments, Surveys, and Analyses

Chairman: David John Kerridge, British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, Scotland (UK); tel: +44-31-667-1000 x234; fax: +44-31-668-4368.


Chairman: Michele Colacino, Istituto di Fisica dell'Atmosfera, Consiglio Nazionale delle Richerche, P. le Luigi Sturzo 31, 00144 Roma (Italy); tel: +39-6-591-0941; fax: +39-6-591-5790; telex: 614344 ATMOS I.


Chairman: C. Agodi Onwumechili, 69 Lansdowne Drive, Hackney, London E8 3EP (UK).

G JS3: Earth Rotation: An Interdisciplinary Approach To Earth System Science (IAG, IAMAS, OCEANS, IASPEI, IAGA, IAHS, SEDI)

The modern approach to understanding Earth rotation irregularities deals with interacting physical constituents as diverse as a liquid, magnetic core, a visco-elastic mantle, and liquid and gaseous external layers, each with internal motions and responding to external forces. The global character of the observational evidence is a major challenge to theoreticians who develop dynamical models of the behavior of each layer. No single theory can explain the complete set of observed irregularities. The monitoring of Earth rotation itself includes the participation of worldwide space geodetic and astronomical programs, leading to intensive international cooperation. The symposium will focus on those aspects of Earth rotation studies that imply, or even create, bridges between scientific disciplines. Lead Convener: M. Feissel (IAG), Observatoire de Paris, Central Bureau, International Earth Rotation Service, 61, Avenue d'Observatoire, F-75014 Paris (FRANCE); tel: +33-1-4051-2226; fax: +33-1-40-51-22-91; e-mail: Co-conveners: D. Cartwright (UK), R. Hide (UK), R. Sabadini (ITALY), J. Wahr (USA), P. Brosche (GERMANY).

GA JS1.02: Relating Geophysical Measurements To Lithospheric Processes Through Continental Drilling (IAGA, IASPEI, ILP)

Multidisciplinary experiments in the vicinity of and within deep boreholes, and laboratory studies of fresh core samples, can provide insights of local problems useful in a more general understanding of the formation of the continental crust. Lead Convener: Volker Haak, GeoForschungsZentrum Potsdam, Telegrafenberg, D-14407 Potsdam (GERMANY); fax: +49-331-288-1235; e-mail: Co-conveners: J. Erzinger (GERMANY), J. Mutter (USA), D. R. Schmitt (CANADA).

GA JS1.05/5. 13: Geomagnetic Secular Variation and Core Flow Near the Core-Mantle Boundary (IAGA, IAG, IASPEI, SEDI)

Time variations of the main geomagnetic field on all timescales from very short (magnetic jerks) to secular, especially with interpretations relating to flow near the core-mantle boundary and global studies at all timescales and using other (e. g., astronomical or seismological) data. Lead Convener: G. Hulot (IPGP), Laboratoire de Geomagnetisme et Palaeomagnestisme, CNRS UA279, 4 Place Jussieu, B89 Tour 24, 75252 Paris Cedex 05 (FRANCE); fax: +33-1-44-27-3373; e-mail: Co-convener: R. A. Langel (USA), D. Crossley (CANADA).

GA JS1.07: Lithospheric Anisotropy Observations and Interpretation (IAGA, IASPEI, ILP)

Contributions are sought from a broad range of topics concerning the electromagnetic and/or seismological identification and characterization of anisotropy. We seek, in particular, studies that address the relation of anisotrophy to the tectonic history, fabric, and stress regime of the continental lithosphere and to mantle flow in the asthenosphere. Studies may be either regional or global in scope. Laboratory measurements of electrical or seismic anisotropy in rocks of deep origin, as well as theoretical studies of the relation between electrical or seismic properties and the petrology of mantle rocks are also encouraged. Finally, reports of theoretical advances in the extraction of anisotropic parameters from analysis of various portions of the seismic wavefield (regional phases, teleseisms, surface waves) are welcome. Lead Convener: Marianne Mareschal, Genie mineral, CP6079, succ Centre Ville, Montreal, H3C 3A7 (CANADA); fax: 1-514-340-4191; e-mail: Co-convener: Michael Bostock (CANADA).

GA JS1.08: Geophysical Signatures of Modern and Ancient Continental Margins (IAGA, IASPEI, ILP)

This symposium focuses on modern and ancient continental margins using a spectrum of techniques (seismology, electromagnetic induction, palaeomagnetism, geodesy, geochemistry, geology, etc) with an emphasis on the synergistic value of multiple approaches to a problem. Lead Convener: John R. Booker, Geophysics AK50, University of Washington, Seattle, WA 98195 (USA); fax: 1-206-543-0489; e-mail: Co-convener: M. Christina Pomposiello (ARGENTINA).

GA JS5.18: Architecture of the Continents Interpretation of Their Main Structural Elements From Magnetic Anomalies and Other

This symposium examines the latest achievements in magnetometry used for study of the deep structure of large-scale geological features such as global orogenic belts_the Urals, for example_within continents, including data analysis, integration with other geophysical data, geophysical and geological modelling. Lead Convener: V. Shapiro, Institute of Geophysics, Amundsen str 100, Ekaterinberg 620219 (RUSSIA). Co-conveners: J. Broome (CANADA), L. Antoine (SOUTH AFRICA).

GA W2.17: The Use of Imaging Riometers in Studies of the Ionosphere and Middle Atmosphere

Several imaging riometers have been installed in recent years and this workshop will concentrate on the use of an imaging riometer network to study the ionosphere and the middle atmosphere. Convener: Hillka Ranta, Geophysical Observatory, Sodankyla SF-99600 (Finland); fax: +358-693-61-0375; e-mail:

M JS2: Equatorial Atmosphere and Ionosphere Interactions (IAMAS, IAGA, ICM)

Results of coordinated studies of the equatorial region (e.g. TOGA-COARE, CADRE, ALOHA, IEEY, MISETA) as they are used to understand better the coupling between phenomena at different altitudes as well as that between phenomena at equatorial and those at higher latitudes. Lead Convener: Robert A. Vincent, Department of Physics, University of Adelaide, Adelaide 5005 (AUSTRALIA); tel: +61-8-303-5758; fax: +61-8-303-4380; e-mail: Co-conveners: A. D. Richmond (USA), S. Kato (JAPAN).

M JS3: Middle Atmosphere Sciences (IAMAS, IAGA, ICMA)

This heading covers four individual symposia: (1) Dynamics of the middle atmosphere; (2) Chemistry, radiation and transport in the middle atmosphere; (3) The polar mesosphere; (4) Solar-terrestrial interactions. Lead Convener: Rolando Garcia, NCAR, P.O. Box 3000, Boulder, CO 80307-3000 (USA); fax: 1-303-497-1400; e-mail: Co-conveners: B. A. Boville (USA), D. Fritts (USA), M. Shiotani (JAPAN), S. Solomon (USA), J. Russell (USA), L. Gray (UK), G. Thomas (USA), G. Witt (SWEDEN), R. Goldberg (USA), L. Hood (USA), J. Lastovicka (CZECH REP).

M W4: Gravity Wave Sources and Parameterizations (IAMAS, IAGA)

Considerable progress has been made in recent years in defining gravity wave source variability and propagation conditions. As a result, we are now in a position to begin to define more quantitatively how these variable sources and the gravity waves they excite influence the atmosphere at greater altitudes. The intent of this workshop is to provide a forum in which our knowledge of source conditions and variability can be used to improve descriptions of these processes in large-scale models. Contributions on all aspects of gravity wave excitation, propagation, spectral evolution, and parameterization are encouraged.

Lead Convener: David Fritts, Laboratory for Atmospheric and Space Physics, University of Colorado, Campus Box 425, Boulder, CO 80309 (USA); tel: 1-303-492-2806; fax: 1-303-492-6946, e-mail:

M W5: Intercomparison of Middle Atmospheric Models (IAMAS, IAGA)

The workshop will discuss and compare the formulation and performance of comprehensive global climate-middle atmosphere models in simulating the present-day climate and its possible response to various forcing mechanisms. Emphasis will be placed on modelling the thermal and dynamical structure of the high-latitude low stratosphere and the quasi-biennial oscillation in the tropics, both of which are known to present problems in such models. Particular attention will be devoted to problems of modelling the exchange of energy and trace constituents between the troposphere and stratosphere, an objective of the SPARC program of the WMO. Lead Convener: Steven Pawson, Institut fur Meteorologie Freie, Universitat Berlin, Carl-Heinrich-Becker Weg 6 - 10, D-12165 Berlin (GERMANY); tel: +49-30-838-71165; fax: +49-30-793-1785, e-mail: Co-convener: R. Rood

S JS3: Long-Term Seafloor Observations and Networks (IASPEI, IAG, OCEANS, ION)

The observation network of global processes is currently nonuniform and undersampled. Establishing long-term seafloor stations to cover 70% of the Earth's surface, hosting most of the active plate boundaries and hot spots, is the key to bringing about a breakthrough in understanding the dynamic Earth. Careful planning and experiments, taking an interdisciplinary approach through international coordination utilizing available resources such as ODP drilled holes and submarine cables, could accelerate such efforts. Scientific objectives and the technological feasibility of establishing deep sea floor stations to observe geophysical or geochemical parameters ranging from ocean to core processes are to be discussed in light of experimental and theoretical studies. Lead Convener: K. Suyehiro, Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164 (JAPAN); tel: +81-3-5351-6439; fax: +81-3-5351-6438; e-mail: Co-conveners: J.-P. Montagner (FRANCE), J. Orcutt (USA), A. Chave (USA), A. Schultz (UK), F. Spiess (USA).

S JS4: Patterns in Earth's Structure and Dynamics: Observations, Earth Models, and Laboratory Measurements (IASPEI, IAGA, IAG)

This symposium will discuss electric, elastic, and ametalic properties from the point of view of observations, modelling, and laboratory investigations. We call for papers which seek to model field observations relevant to Earth's internal physical structure in ways which are also compatible with current laboratory measurements. We also seek papers which show contradictions between current models, data, and laboratory studies, and which therefore indicate a need for future work. Lead Convener: S. Constable, Institute of Geophysics and Planetary Physics, Scripps Institute of Oceanography, La Jolla, CA 92093-0225 (USA); tel: 1-619-534-2409; fax: 1-619-534-8090; e-mail: Co-conveners: A. G. Duba (USA), I. Jackson (AUSTRALIA), J.-P. Poirier, (FRANCE), T. A. Herring (USA).

S JS5 Structure, Evolution, and Dynamics of the Core-Mantle Boundary Region (IASPEI, IAGA, IAG, SEDI)

The session will focus on new observations, coupled with laboratory and theoretical results bearing on the structure and evolution of the Earth's core-mantle boundary. The objective will be to bring together researchers from a wide variety of disciplines_from seismology, geodesy and geomagnetism to geodynamics, geochemistry and mineral physics_in elucidating what is arguably the most significant geological structure of our planet. Lead Convener: R. Jeanloz, Department of Geology and Geophysics, University of California, Berkeley, CA 94720 (USA); tel: 1-415-642-3993; fax: 1-415-643-9980; telex: 9103667114; e-mail: Co-conveners: B. Buffett (CANADA), K. Whaler (UK).

S JW1: Geophysical Networks_Possibilities for and Problems With Co-Location of Instruments (IASPEI, IAGA, IAG)

The study of potential fields, seismicity, and deformation can be significantly enhanced with standardized observational networks. With the development of digital recording and storage, the rapid growth in global communication systems, and an improving political climate, it is now possible to record and access data from unattended sensors from many previously inaccessible regions of the Earth. Global and regional networks of geophysical instruments for observations in fields such as seismology, geodesy, and geomagnetism are being established or expanded by research and monitoring organizations in many countries. Because of the high costs of establishing and servicing remote sites, there are significant logistical advantages in the co-location of sensors, possibly with common data recording and access. There are difficulties, however, in finding sites that satisfy the sometimes diverse requirements for different types of observation, coordinating siting plans, and establishing arrangements for long-term support and maintenance. This workshop will review the status of global and regional networks in a variety of geophysical disciplines, consider the opportunities for the development of coordinated programs, and explore the scientific insights that might develop from integrated observations. Lead Convener: D. W. Simpson, Incorporated Research Institute for Seismology, 1616 N. Fort Myer Drive, Suite 1050, Arlington, VA 22209 (USA); tel: 1-703-524-6222; fax: 1-703-527-7256; telex: 7400457 IRIS UC; e-mail: Co-conveners: G. Beulter (SWITZERLAND), G. Boedecker (GERMANY), D. Kerridge (UK), G. Roult (FRANCE).

S JW2: Geophysical Data Challenges in the 21st Century (IASPEI, IAG, IAGA, CODATA, WDC)

This workshop will focus on the changing requirements of the research community for access to geophysical data in the next century. The workshop will discuss both new scientific programs that will be dependent on data availability, and the impact of new data technology on these programs. Important aspects of this new technology are likely to involve high band-width networks, distributed data archive and dissemination facilities, sophisticated network search and retrieval systems, parallel processor computing facilities, and innovative ways to provide data to nontechnical users. These will be accompanied by software developments such as hierarchical data systems, artificial intelligence and neural networks, the use of geographic information systems, and advances in optical character recognition methods. This workshop will provide a forum for interactions between research geophysicists and the computer scientists who will design the data systems of the future. Lead Convener: M. A. Chinnery, National Geophysical Data Center, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80303 (USA); tel: 1-303-497-6215; fax: 1-303-497-6513; telex: 592811 NOAA MASC BDR; e-mail: Co-conveners: G. A. Sobolev (RUSSIA), C. C. Tscherning (DENMARK).

GA 1.01/2. 08/3. 16/4. 05/5. 05: Solar Wind Structures, Energetic Solar Particles, Geomagnetic Activity, and Associated Phenomena

This symposium focuses on the physical linkages between structures and events in the solar atmosphere and those in the solar wind near 1AU, examining how the resulting interplanetary structures and particle events perturb the magnetosphere, the ionosphere, and the atmosphere; interdisciplinary emphasis. Lead Convener: J. T. Gosling, MS D466, Los Alamos National Laboratory, Los Alamos, NM 87545 (USA); fax: 1-505-665-7395; e-mail: Co-conveners: D. H. Tarling (UK), J. Lastovicka (CZECH REP), A. Berthelier (FRANCE).

GA 1.04: Core Dynamics and the Dynamo

This session covers numerical and theoretical models, reversal mechanisms, convective processes, magnetic instabilities, core-mantle coupling, lateral inhomogeneities, and mantle precession. Contributions on nonmagnetic aspects of core dynamics will also be welcome. Convener: C. A. Jones, Mathematics Department, University of Exeter, Exeter EX4 4QE (UK); fax: +44-392-263-997; e-mail:

GA 1.06: Reversals Observations and Theory

This session deals with analysis of observatory annual means, geomagnetic impulses and jerks, global secular variation, fluid flow near the core-mantle boundary, flux diffusion and magnetic diffusion in the mantle, secular variation and studies of the Earth's deep interior, and preferred paths of transitional VGPs. Lead Convener: D. Gubbins, Department of Earth Sciences, University of Leeds, Leeds LS2 9JT (UK); e-mail: Co-convener: B. M. Clement (USA).

GA 1.10: Multidimensional Mathematical Advances in Electromagnetic Induction_Decomposition, Modelling, and Inversion

This symposium deals with all aspects of theoretical and practical development in electromagnetic modelling and inversion, especially the application of new methods to real data sets. Lead Convener: E. Gomez-Trevino, CICESE, Geofisica, P.O. B 434 843, San Diego, CA 92143-4843 (USA); fax: 1-706-674-4502; e-mail: Co-convener: T. Smith (UK).

GA 1.11/2. 16/5. 08: Multidimensional Currents Over Multidimensional Earth Structures_Theory and Observations

This session covers theoretical and observational studies treating both external currents and Earth conductivity as spatially structured and the influence on the characteristics of geomagnetic variations at diurnal periods and less. Lead Convener: A. G. Jones, Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3 (CANADA); fax: 1-613-992-8836; e-mail: Co-conveners: A. D. Richmond (USA), E. W. Mbipom (NIGERIA).

GA 1.12: Electromagnetic Studies of the Solid Earth

This session features papers on electromagnetic studies which do not fit in with other sessions, especially those on field, laboratory, and theoretical studies of EM induction and electrical conductivity in the Earth and in earth materials. Lead Convener: Steven Constable, Scripps Institute of Oceanography, La Jolla, CA 92093-0225 (USA); e-mail: Co-conveners: S. I. Fontes (BRAZIL), X. R. Kong (CHINA).

GA 1.13: Magnetic Signature of Environmental Change

This symposium features basic and applied rock magnetic studies quantifying the influences of temperature, humidity, mineralogy, microstructure, and chemistry on the magnetic proxy records of environmental change, past and recent, as well as studies of those records themselves. Lead Convener: Subir Banerjee, Institute for Rock Magnetism, School of Earth Sciences, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, MN 55455-0219 (USA); fax: 1-612-625-3819; e-mail: Co-convener: Jan Bloemendal (UK).

GA 1.14: Archaeosecular and Palaeosecular Variations

This session will cover results and analyses of sequences of sediments, lava flows, and cave deposits, particularly high-resolution extension of the observational record at the historical end of the timescale, palaeointensity records from sediments, palaeosecular variation, and global approaches to the long secular variation records. Lead Convener: Charles E. Barton, Australian Geological Survey Organization, GPO Box 378, Canberra, ACT 2601 (AUSTRALIA); fax: +61-6-249-9986; e-mail: Co-convener: Q. Y. Wei (CHINA).

GA 1.15: Innovations in Palaeointensity Studies

This symposium features new approaches to the problem of acquiring palaeointensity data from archaeological and geological material, as well as the implication of data sets that have been obtained recently or analyzed in a new way. Lead Convener: Lisa Tauxe, Fort Hoofddijk, Budapestlaan 17, 3508 T. A. Utrecht (Netherlands); fax: +31-30-53-5030; e-mail: Co-convener: J.-P Valet (FRANCE).

GA 1.16: High-Resolution Magnetostratigraphy

Studies with accurate time control of short events and excursions to determine their global significance, comparisons with cryptochrons ("tiny wiggles") derived from the ocean floor, and time constants of the geodynamo, as well as links to the GPTS and marine-continental correlations are the subjects to be covered in this symposium. Lead Convener: C. G. Langereis, Paleomagnetic Laboratory, Utrecht University, Fort Hoofddijk, Budapestlaan 17, 3584 CD Utrecht (NETHERLANDS); fax: +31-30-53-5030; e-mail: Co-convener: John Shaw (UK).

GA 1.17: Nature of Remagnetizations

Papers are invited on rock-magnetic, geochemical, and other characteristics and identification of chemical, thermoviscous, and strain-related secondary magnetizations, as well as the origin of late Palaeozoic secondary magnetizations, dating of diagenetic events, and the distinction of secondary from primary magnetizations. Lead Convener: R. Douglas Elmore, School of Geology and Geophysics, University of Oklahoma, Norman, OK 73019-0628 (USA); fax: 1-405-325-3140; e-mail: Co-convener: Trond H. Torsvik (NORWAY).

GA 1.18: Palaeomagnetism and Tectonics

This session features papers on palaeographic and tectonic implications of the database of the Tethys Ocean: motion of the continents since Palaeozoic times, dispersion and accretion of blocks in the Caribbean and Tethyan area, and continental deformation of the Eurasian margin. Lead Convener: Jean Besse, IPGP Laboratorie de Geomagnetisme et Paleomagnetisme, 4 Place Jussieu, F-75252 Paris cedex 5 (FRANCE); fax: +33-1-4427-3373; e-mail: Co-conveners: Augusto Rapalini (ARGENTINA), Jim Channel (USA).

GA 1.19: Applications of Magnetic Anisotropy

This session features discussion of new experimental approaches, theoretical modelling of magnetic anisotropy in rocks, interpretation methodologies, and case histories of geological applications. Lead Convener: D. A. Clark, CSIRO Division of Exploration and Mining, P.O. Box 136, North Ryde, New South Wales 2113 (AUSTRALIA); fax: +61-2 887-8874; e-mail: Co-conveners: G. Borradaile (CANADA), A. Kapicka (CZECH REP).

GA 1.20: Properties of Minor Magnetic Materials

Fundamental rock magnetic properties (hysteresis, thermal, magnetic transition) as well as spectroscopic and other nonmagnetic means of identifying minerals of palaeomagnetic interest (greigite, pyrrhotite, maghemite, ilmeno-hematite, goethite, and other rarer natural magnetic minerals will be featured in this symposium. Lead Convener: Mark J. Dekkers, Palaeomagnetic Laboratory, Fort Hoofddijk, Budapestlaan 17, 3584 CD Utrecht (NETHERLANDS); fax: +31-30-53-5030; e-mail: Co-convener: Buffy McClelland (UK).

GA 1.21: New Approaches in Rock Magnetism

Papers on domain structures associated with different types of remanence; domain imaging; comparisons of observed and theoretical domain structure; PSD versus MD behaviour; new techniques for magnetic carriers and domain state, for discriminating between different species of NRM and the time/temperature stability of NRMs are solicited for this session. Lead Convener: Susan L. Halgedahl, Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112-1183 (USA); fax: 1-801-581-7065; e-mail: Co-convener: Franz Heider (GERMANY).

GA 2.01: Upper Atmosphere Structure, Dynamics, and Electrodynamics

The thermosphere-ionosphere system, including its coupling with the mesosphere is ths subject of this symposium. Four principal aspects will be covered: structure and composition; gravity waves, tides and long-term variations; effects of planetary wave normal modes; and electrodynamic phenomena. Lead Convener: Sheila Kirkwood, Swedish Institute of Space Physics, P.O. Box 812, 98128 Kiruna (SWEDEN); fax: +46-980-79050; e-mail: Co-conveners: G. Price (AUSTRALIA), C. Lathuillere (FRANCE), A. Manson (CANADA), J. Forbes (USA), R. Goldberg (USA).

GA 2.02: Aeronomy of Aurora and Airglow Emissions and Related Laboratory Measurements

This symposium will feature observational studies from the ground, from balloons, from rockets, and from satellites; remote sensing based on airglow and or auroral observations; analytical and modelling studies on excitation processes; and laboratory studies of cross sections and reaction rates. Lead Convener: Ian McDade, Department of Earth and Atmospheric Science, York University, 4700 Keele Street, North York, Ontario M3J 1P3 (CANADA); fax: 1-41-736-2100; e-mail: Co-convener: D. Murtagh (SWEDEN).

GA 2.03: Ionospheric Irregularities and Instabilities

Observations of ionospheric irregularities by ground-based or in situ techniques and theories of their generating mechanism, in particular plasma instabilities will be covered in this session. Lead Convener: Raymond Greenwald, Applied Physics Laboratory, Johns Hopkins University, Johns Hopkins Road, Laurel, MD 20723-6099 (USA); fax: 1-301-953-6670; e-mail: Co-convener: E. Blanc (FRANCE).

GA 2.04: Developments in Instrumentation and Absolute Calibration

Recent developments in detector, optical, radiometric techniques; data collection and processing technologies used in aeronomical research; and techniques of absolute calibration will be covered in this session. Lead Convener: S. Chakrabarti, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (USA); fax: 1-617-353-6463; e-mail: Co-convener: E. Hilsenrath (USA).

GA 2.05/7. 03: Equatorial Ionosphere-Thermosphere System

This session will feature studies of equatorial plasma, neutral dynamics, and electric fields relating to spread F, ionization anomaly, and electrojet phenomena, under quiet and disturbed conditions. Results from coordinated campaigns, especially the Equatorial Ionosphere-Thermosphere Study (EITS), are solicited. Lead Convener: Mangalathayil A. Abdu, INPE, CP 515, Sao Jose dos Campos - SP 12200 (BRAZIL); fax: +55-123-218-743; e-mail: inpedae@brfapesp.bitnet. Co-conveners: K. D. Cole (AUSTRALIA), C. Amory-Mazaudier (FRANCE), J. H. Sastri (INDIA).

GA 2.09/3. 08: Planetary Atmospheres and Magnetospheres

This session will include observations, theories, and models of planetary upper atmospheres, ionospheres and magnetospheres, and mutual coupling, as well as interactions with rings, solid surfaces, and satellite tori. Lead Convener: Michel Blanc, Observatoire Midi-Pyrenees, 14 ave Edouard Belin, 31400 Toulouse (FRANCE); fax: +33-61-53-6722; e-mail: Co-conveners: T. E. Cravens (USA), K. K. Khurana (USA).

GA 2.10/3.05: Large-Scale Electrodynamics in the Coupled Magnetosphere - Ionosphere - Thermosphere System

Studies of the response of the coupled magnetosphere-ionosphere-thermosphere system to variations in the solar wind, including patterns of convection, electric currents, auroral forms, and conductance will be featured in this session. Lead Convener: D. J. Knipp, Department of Physics, Fairchild Hall Suite 2A6, U.S. Air Force Academy, Colorado 80840-6254 (USA); fax: 1-719-472-2947; e-mail: Co-convener: R. J. Walker (USA).

GA 2.11/3.09: High-Latitude Aurorae Formation, Morphology, Dynamics, and Use As A Diagnostic Tool

Papers on formation and dynamics of the visual aurora and associated ionospheric plasma and electric and magnetic fields, in particular multi-instrument studies that address the relation between magnetospheric and ionospheric phenomena, are solicited for this symposium. Lead Convener: H. J. Opgenoorth, Swedish Institute of Space Physics, Uppsala Division, S-755 91 Uppsala (SWEDEN); fax: +46-18-40-3100; e-mail: Co-conveners: R. D. Elphinstone (CANADA), C. W. Carlson (USA).

GA 2.12/3.02/4.04: Magnetosheath, Magnetopause, Boundary Layers, and Cusp_A Coupled System

Papers on observational, theoretical, and numerical studies of phenomena and processes in the magnetosheath, magnetopause, boundary layers and cusps, with emphasis on interrelationships and interactions through particles, fields, waves and currents, and their ionospheric signatures will be featured in this session. Lead Convener: P. Song, High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 (USA); fax: 1-303-497-1589; e-mail: Co-conveners: C. T. Russell (USA), A. Egeland (NORWAY), D. J. Southwood (UK).

GA 2.13/3.03: Dynamics of the Magnetotail and High-Latitude Nightside Ionosphere

This symposium will examine tail configuration, by control, tailward extension of the LLBL, plasma heating and acceleration, plasma and flux rope formation, polar convection, and continuity of transpolar features. Lead Convener: A. Nishida, Institute of Space and Astronautical Science, Yoshinodai 3-chome 1-1, Sagamihari, Kanagawa 229 (JAPAN); fax: +81-427-594326; e-mail: Co-conveners: H. C. Carlson (USA), V. Angelopoulos (USA).

GA 2.14/3.04: Inner Magnetosphere Ring Current, Radiation Belts, and Plasmasphere

This symposium will feature coupling between the energetic and the thermal populations; wave generation; particle diffusion and collisional scattering; the effects of large-scale currents and electric fields; and feedback from the underlying ionosphere. Lead Convener: J. U. Kozyra, 1411-C Space Research Building, University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143 (USA); fax: 1-313-747-3083; e-mail: Co-conveners: D. C. Hamilton (USA), Y. Kamide (JAPAN).

GA 2.15/3.11: Interhemispheric Contrasts in Substorm Signatures

This symposium will feature experimental and theoretical evaluation of significant interhemispherical contrasts in the signatures of substorms to provide critical tests of competing theories. Lead Convener: John R. Dudeney, British Antarctic Survey, Madingley Road, Cambridge CB3 0ET (UK); fax: +44-223-62616; e-mail: Co-convener: J. C. Samson (CANADA).

GA 3.01: Reporter Reviews

This session includes invited reviews on the magnetopause boundary, the geomagnetic tail, the inner magnetosphere, large-scale magnetospheric fields and flows, large-scale structure of magnetospheric plasma, planetary magnetospheres, wave-particle interactions, ULF waves, and active and laboratory experiments. Convener: S. W. H. Cowley, Blackett Laboratory, Imperial College, London SW7 2BZ (UK); fax: +44-71-594-7772; e-mail:

GA 3.06: ULF Wave Response of the Magnetosphere To Solar Wind Energy Input

This session will deal with all aspects of solar wind influence, and control and modification of the magnetospheric ULF spectrum, including allied magnetosheath and polar cusp phenomena. Lead Convener: D. J. Southwood, Blackett Laboratory, Imperial College, London SW7 2BZ (UK); fax: +44-71-823-8250; e-mail: Co-conveners: C. T. Russell (USA), F. W Menk (AUSTRALIA).

GA 3.07: Nonlinear and Kinetic Effects in ULF Waves

Papers on nonlinear evolution of ULF plasma waves and kinetic effects in their interaction with the plasma population, as well as studies of the lowest frequency MHD waves (including ULF pulsations) and extension to waves at or near the ion cyclotron frequency are solicited for this symposium. Lead Convener: J. C. Samson, Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1 (CANADA); SPAN:canedm:samson; fax: 1-403-492-4256. Co-convener: R. L. Lysak (USA).

GA 3.10: Active and Laboratory Experiments in Space Plasma Physics

A central focus of this symposium will be to foster contact between scientists engaged in laboratory and active experiments and the rest of the space plasma community, with the aim of inspiring future research. Lead Convener: W. Gekelman, Department of Physics, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90024 (USA); fax: 1-310-206-5484; e-mail: Co-conveners: V. N. Oraevsky (RUSSIA), S. Robertson (USA).

GA 3.12: Whistler-Mode Waves and Particle Precipitation

This session will examine precipitation into the ionosphere of energetic electrons by natural and artificial whistler-mode waves, observations and modelling of these interactions, and associated ionospheric effects. Lead Convener: A. J. Smith, British Antarctic Survey, Madingley Road, Cambridge CB3 0ET (UK); fax: +44-223-62616; e-mail: Co-convener: U. S. Inan (USA).

GA 3.13: Modelling and Theory for Mission Design and Data Interpretation

Papers on modelling of the global magnetospheric system and of critical interface regions with the solar wind as required to aid space mission planning and subsequent data interpretation, as well as design and testing of new diagnostic tools will be featured in this symposium. Lead Convener: P. J. Tanskanen, Department of Physics, University of Oulu, Linnanmaa, FIN-9057 Oulu (FINLAND); fax: +358-81-553-1287; e-mail: Co-convener: A. Roux (FRANCE).

GA 3.14: Magnetospheric Models and Their Critical Evaluation

This session will deal with theoretical, computational, and empirical models of the magnetosphere and their intercomparison; model evaluation and comparison with observations are welcomed. Lead Convener: T. I. Pulkkinnen, Finnish Meteorological Institute, P.O. Box 503, SF-00101 Helsinki (FINLAND); fax: +358-0-192-9539; e-mail: Co-convener: G. D. Reeves (USA).

GA 3.15/4.03: Pick-Up and Seed Ions in Space Plasmas and Their Acceleration Processes

This session will examine interstellar, cometary and magnetospheric pick-up ions (or similar suprethermal ions) in the solar wind and planetary magnetospheres: behaviour, spatial distribution, scattering and energization, wave excitation, and role as seed ions for subsequent acceleration, for example, at shocks. Lead Convener: M. A. Lee, SSC-Morse Hall, University of New Hampshire, Durham, NH 03824 (USA); fax: 1-603-862-1915; e-mail: Co-convener: A. J. Coates (UK).

GA 3.17/5.04: Artificial Intelligence Applications in Magnetospheric Modelling and Forecasting

Papers on AI techniques for capturing human expertise on geomagnetic effects of the Sun and the solar wind into computer programs and application of neural networks, expert systems, genetic algorithms, and fuzzy logic are solicited for this session. Lead Convener: R. L. McPherron, IGPP, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles CA 90024-1567 (USA); fax: 1-310-206-8042; e-mail: Co-convener: A. N. Zaitzev (RUSSIA).

GA 4.01: Results of Ulysses Latitude Survey and Comparison With Models

This session will feature main experimental results and relevant theoretical analysis and modelling on the high heliolatitude solar wind plasma, magnetic field, and energetic particle populations. Convener: E. J. Smith, Jet Propulsion Laboratory, MS 169-506, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 (USA); fax: 1-818-354-8895; e-mail: JPLSP::ESMITH\Span.

GA 4.02: Observations of the Sun By Ulysses

This session is primarily a session of invited a review papers on solar X-ray and gamma-ray measurements by spacecraft such as Ulysses, GRANAT, and Yohkoh, with relevant radio and particle measurements; however, some contributions will be accepted. Convener: K. Hurley, Space Science Laboratory, University of California, Berkeley, CA 94720 (USA); e-mail:

GA 4.06: Solar/Planetary/Interstellar Origin of Interplanetary Plasma Composition

Papers on the relative importance in the interplanetary medium of the various sources of solar wind and energetic particles, planetary and cometary neutrals and pick-up ions, and interstellar gas are solicited for this session. Convener: J. G. Luhmann, Room 6877 Slichter Hall, University of California, Los Angeles, IGPP, Los Angeles, CA 90024-1567 (USA); fax: 1-310-206-3051; e-mail: BRUNET::JGLUHMANN/Span.

GA 4.07: Structural Approach To Heliospheric Plasmas Turbulence, Fractals, Chaos

This symposium will feature the latest advances in understanding the solar wind, both in its astrophysical context and as an example of a nonlinear dynamical system. Convener: M. L. Goldstein, Goddard Space Flight Center, MS 6920, Bldg. 2, Room 128, Greenbelt, MD 20771 (USA); fax: 1-301-286-1683.

GA 4. 08: Local Interstellar Cloud and the Boundary of the Heliosphere

The solar interstellar environment (with particular attention to the ionization state, the magnetic field, and the energetic particles) and the resultant constraints on solar wind expansion will be examined in this session. Convener: R. Lallement, Service d'Aeronomie du CNRS, BP 3, F-91371 Verrieres-le-Buisson (France); fax: +33-1-6920-2999.

GA 4.09: Planetary Bowshocks

This symposium will feature large-scale phenomena and the microstructure of the shock transition: reviews of the experimental data and the most promising theoretical descriptions. Contributions on significant new results are welcome. Convener: I. S. Veselovsky, Institute of Nuclear Physics, Moscow State University, Moscow 119899 (Russia); fax: +7-095-939-5034; e-mail:

GA 4.10: Reporter Reviews

This symposium will feature review papers on the physics of the solar corona, short- and long-term variability of the solar wind (including effects of energetic particles and cosmic ray moderated shocks), heliospheric VLF emissions, solar wind interaction with nonmagnetic bodies, and physics of interplanetary dust grains. Convener: S. Grzedzielski, COSPAR, 51 Bd de Montmorency, 75016 Paris (France); fax: +33-1-4050-9827; Omnet: COSPAR.PARIS/Omnet; e-mail: 29531::COSPAR/Span.

GA 5.01: Modern Observatory and Repeat Station Instruments and Practice

Developments in instruments for use in magnetic observatories and for field work and new methods in absolute measurements and developments in data-collection and data-processing will be examined in this session. Lead Convener: O. Rasmussen, Division of Solar-Terrestrial Physics, Danish Meteorological Institute, Lyngbyvej 100, DK 2100 Copenhagen (DENMARK); fax: +45-3915-7460; e-mail: Co-convener: L. Hegymegi (HUNGARY).

GA 5.02: Ocean Bottom Geomagnetic Observatories

This symposium will discuss distribution, construction, and deployment of ocean bottom observatories and methods for automatically making absolute measurements on the ocean bottom, providing data for studying secular variation at the core-mantle boundary, for spherical harmonic modelling, and control of satellite surveys. Lead Convener: A. W. Green, Jr., U. S. Geological Survey, Denver Federal Center, MS 968, P.O. Box 25046, Denver, CO 80225-0046 (USA); fax: 1-303-273-8450; e-mail: Co-conveners: L. Law (CANADA), J. Rasson (BELGIUM).

GA 5.03: Instruments and Data Acquisition Systems for High Time- and Amplitude-Resolution Geomagnetic Data

Instruments, techniques, and data acquisition systems required to obtain the high-resolution data (better than 1-minute) that is needed for space physics research, for analysis of geomagnetic storm effects on power grids and pipelines, and for induction studies will be the topic of this symposium. Lead Convener: E. W. Worthington, National Geomagnetic Information Center, U.S. Geological Survey, Denver Federal Center, MS 968, P.O. Box 25046, Denver, CO 80225-0046 (USA); fax: 1-303-273-8450; e-mail: Co-convener: K. Yumoto (JAPAN).

GA 5.06: Geomagnetic Applications

Examination of the different environmental factors affecting technological systems and determination of critical levels for geophysical phenomena; in particular, interdisciplinary studies that examine both the geophysical and the engineering aspects will be featured in this session. Lead Convener: D. H. Boteler, Geological Survey of Canada, 1 Observatory Crescent, Ottawa K1A 0Y3 (CANADA); fax: 1-613-824-9803; e-mail: Co-convener: M. E. Shea (USA).

GA 5.07: Application Data Systems Real-Time, On-Line and On Disc

This session will presen the latest and the best ways of providing database access and other services. Hands-on demonstrations of systems on computers, provided or supplied, will be welcomed. Lead Convener: J. H. Allen, WDC-A for Solar-Terrestrial Physics, NOAA code E/GC2, 325 Broadway, Boulder, CO 80303 (USA); fax: 1-303-497-6513; e-mail: Co-convener: R. Clauer (USA).

GA 5.09: Field Behaviour On Non-Active Days At World Locations

Behaviour of the quiet time field changes, their relationship to other geophysical processes in the thermosphere and magnetosphere, and their application to the understanding of external sources and internal earth structure will be discussed at this session. Lead Convener: W. H. Campbell, U.S. Geological Survey, Denver Federal Center, MS 968, P.O. Box 25046, Denver, CO 80225-0046 (USA). Co-convener: H. Deebes (EGYPT).

GA 5.10: Geomagnetic Indices

This symposium welcomes papers that demonstrate the value of indices in characterizing the state of the magnetosphere, papers showing the limitations of indices that are currently available, proposals for new indices, and papers on the production of indices in real-time from digital data and applications. Lead Convener: M. Menvielle, Laboratoire de Physique de la Terre et des Planetes, Bat 504, Universite Paris Sud,
F-91405, Orsay cedex (FRANCE); fax: +33-1-6941-8369; e-mail: Co-conveners: T. Iyemori (JAPAN), R. L. Coles (CANADA).

GA 5. 12: Analysis and Modelling of Low Earth Orbit Magnetic Survey Satellite Data With Respect To the Core, Crust, Ionosphere

Analyses and modelling of satellite geomagnetic data with respect to the spatial and temporal behaviour of magnetic fields associated with the Earth's core, crust, and ionosphere, and with respect to induction fields associated with the crust and mantle, are solicited. Lead Convener: J. M. Quinn, Code N342, U.S. Naval Oceanographic Office, Stennis Space Center, MS 39522-5001 (USA); fax: 1-601-688-5605; e-mail: Co-convener: Y. Cohen (FRANCE).

GA 5. 14: Global and Regional Magnetic Field Models and Charts

Presentation on data acquisition and data processing, modelling and charting methods, the IGRF, and accuracy requirements of reference fields for various applications of models and charts. The need for geomagnetic reference field data for compass navigation now that cheap satellite positioning systems are available will also be featured. Lead Convener: C. Barton, Australian Geological Survey Organisation, GPO Box 378, Canberra, ACT 2601 (AUSTRALIA); fax: +61-62-49-9986; e-mail: Co-convener: D. R. Barraclough (UK).

GA 5.15: Novel Techniques in Acquisition, Processing, Presentation, and Integrated Interpretation of Magnetic Anomaly Data

Global positioning systems have spearheaded the quest for higher data quality; data are often presented as images, often using satellite image-processing techniques with or without Laplacian processing. Papers addressing this general area of development are sought. Lead Convener: C. Reeves, ITC International Institute for Aerospace Survey and Earth Sciences, Department of Earth Resources Surveys, Kanaalweg 3, 2628 EB Delft (NETHERLANDS); fax: +31-15-623-961. Co-conveners: K. A. Whaler (UK), D. Teskey (CANADA).

GA 5.16: Magnetic Anomalies in the North Atlantic and Arctic Oceans and Surrounding Regions

This session will feature recent compilations of magnetic surveys for tectonic interpretation; structure of the magnetic layer of the crust formed under slow spreading, anomaly patterns of the fracture zones, anomalies of passive continental margins, and application of detailed aerial and marine surveys for oil and gas geology in the North Eurasian shelves. Lead Convener: S. Mashchenkov, All-Union Institute for Geological and Mineral Resources of the World Ocean, Maklina Pr 1, St Petersburg 190121 (RUSSIA); fax: +7-812-114-1470; e-mail: Co-conveners: J. Verhoef (CANADA), P. Taylor (USA).

GA 5.17: Antarctic Magnetic Anomalies

This session will discuss progress and problems of mapping, processing, and interpreting magnetic anomalies of Antarctica and adjacent marine areas. Lead Convener: R. von Frese, Department of Geological Sciences, Ohio State University, Columbus, OH 433210 (USA); fax: 1-614-292 7688; e-mail: Co-conveners: A. Johnson (UK), A. Meloni (ITALY).

GA 5.19: Magnetic Petrology and Magnetic Signatures of Ore Deposits and Ore Environments

Contributions on magnetic properties and magnetic expressions of mineralized environments, particularly integrated magnetic/petrological studies (including properties and signatures of magnetite, pyrrhotite, sedimentary basins, magmatic, metamorphic, and hydrothermal processes) will be featured in this symposium. Lead Convener: D. Clark, CSIRO Division of Exploration and Mining, P.O. Box 136, North Ryde, New South Wales 2113 (AUSTRALIA); fax: +61-2-887-8874; e-mail: Co-convener: S. Zhakherov (RUSSIA).

GA 5.20: Advances in Magnetic Modelling and Efficient Interpretations of Large Magnetic Data Sets

This session will cover established methods for inverse solutions and forward models that suffer under the sheer size of data sets now available; Euler's homogeneity relation and analytic signal methods are new techniques; discussion of the strengths and weaknesses of the different approaches, plus visualization of the results. Lead Convener: M. Purucker, Geodynamics Branch, Hughes-STX Corporation, Code 921, Goddard Space Flight Center, Greenbelt, MD 20771 (USA); fax: 1-301-286-1616; e-mail: Co-convener: J. Arkani-Hamed (CANADA).

GA 5.22: Local Time Changes of the Earths Magnetic Field Caused By Recent Tectonic Processes (Tectonomagnetic Method)

This session will discuss methods of investigation, studies of the physical processes that cause local variations in the geomagnetic field (e.g., piezomagnetism, electrokinetic effects), and modelling, as well as results of the application of the tectonomagnetic method in studies of tectonic processes and earthquake precursors in combination with other geodynamical methods. Lead Convener: J. Podsklan, Research Institute for Geodesy, Topography and Cartography, 250 66 Zdiby 98 (CZECH REP); fax: +42-2-685-7056; e-mail: Co-convener: V. Kuznetsova (UKRAINE).

GA 6.01: History of Geophysics and of Global Change

The historical investigations have to be grouped into three main classes: (1) history of the development of scientific ideas; (2) history of the environment, of global change, and of the anthropic action on climate; (3) history of the impact of climate, environment, and natural catastrophes on mankind. All three are relevant to this session and contributions are invited. Lead Convener: Michele Colacino, Istituto di Fisica dell'Atmosfera, P. le Luigi Sturzo 31, 00144 Roma, (ITALY); fax: +39-6-591-5790. Co-conveners: L. M. Barreto (BRAZIL), Deborah C. Day (USA),Wilfried Schroeder (GERMANY).

GA 7.01: Activities and Results of the International Equatorial Electrojet Year (IEEY)

This session features the presentation and review of results and data acquired during the IEEY and other equatorial electrojet studies. Lead Convener: Christine Amory Mazaudier, CNET/CNRS/CRPE, 4 avenue de Neptune, 94107 Saint Maur-des-Fosses (France); fax: +33-1-4889-443. Co-convener: C. Agodi Onwumechili (UK).

GA 7.02: Priorities in Geomagnetism and Aeronomy in Developing Countries

This session focuses on the research areas, training, instrumentation, and technology in geomagnetism and aeronomy most suitable for developing countries. Lead Convener: Attia A. Ashour, Department of Mathematics, Faculty of Science, University of Cairo, Giza, Cairo (Egypt). Co-convener: L. M. Barreto (BRAZIL).

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IUGG XXI General Assembly