TAMAS I. GOMBOSI is presently senior editor of the Journal of Geophysical Research—Space Physics. In the mid 1970s he was the first foreign national to do postdoctoral research at the Space Research Institute in Moscow, where he participated in the data interpretation of the Venera-9 and Venera-10 Venus orbiters. A few years later he came to the United States to participate in theoretical work related to NASA's Venus exploration. In the early 1980s he played a leading role in the planning and implementation of the international VEGA mission to Venus and Halley's comet. He played a pioneering role in the development of modern cometary plasma physics. Also, he was among the first scientists to explain the acceleration of pickup ions by self-generated, low-frequency MHD waves. Dr. Gombosi is author or coauthor of about 150 peer-reviewed scientific publications and over 250 presentations.

RAYMOND A. GREENWALD is supervisor of the Ionospheric and Atmospheric Remote Sensing Group in the Space Sciences Branch of the Applied Physics Laboratory at Johns Hopkins University. He is active in the ISTP community and is widely known for the design and development of the STARE radar system in northern Scandinavia, which studies the circulation of the high-latitude ionosphere. He is also associated with the development of the extensive high-latitude network of HF radars known as SuperDARN and is currently chairman of the international SuperDARN Executive Committee.

JUDITH T. KARPEN is a research astrophysicist in the Solar-Terrestrial Relationships Branch of the Space Science Division of the Naval Research Laboratory. Her primary research interests include analytical and numerical modeling of dynamic solar and heliospheric phenomena and applications of plasma physics and magnetohydrodynamics to solar and astrophysical activity. She has been involved in analysis and interpretation of solar data obtained with the hard X-ray burst spectrometer on OSO-5 and with the NRL X-ray spectrometer (SOLPLEX) and white-light coronagraph (SOLWIND) on board the P78-1 satellite. Since 1984, Dr. Karpen has been a coinvestigator or principal investigator in numerous research projects sponsored by NASA, AFGL, and DOD. She is currently chair of the AAS Solar Physics Division and was a member of the MOWG advising the NASA Solar Physics Branch for several years.

GLENN M. MASON is professor jointly in the Department of Physics and the Institute for Physical Science and Technology at the University of Maryland, College Park. He has worked on the development of novel instrumentation that allows determination of the mass composition of solar and interplanetary particles in previously unexplored energy ranges. His research work has included galactic cosmic rays, solar energetic particles, and the acceleration and transport of particles both in the solar atmosphere and in the interplanetary medium. He is principal investigator on the NASA Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) spacecraft mission and is coinvestigator on energetic particle instruments for the NASA Wind spacecraft and the NASA Advanced Composition Explorer (ACE) spacecraft. He was formerly chair of the NASA Sun-Earth Connections Advisory Subcommittee (SECAS) and the NASA Space Science Advisory Committee (SScAC) and is currently a member of the NAS/NRC Committee on Solar and Space Physics.

MARGARET A. SHEA has worked in the geophysics division of the Air Force laboratory at Hanscomb Air Force Base since 1964. She has received numerous Air Force awards for superior performance and in 1985 was a recipient of the Air Force Geophysics Laboratory Guenter Loeser Memorial Award for outstanding career contributions. She was elected to be an associate of the Royal Astronomical Society (equivalent to fellow) in 1991, and in 1995 she was elected as corresponding member of the International Academy of Astronautics.

KEITH T. STRONG is currently the manager of the Lockheed Martin Solar and Astrophysics Laboratory and director of the Space Science Independent Research Program. Also, since 1991 and 1994, respectively, he has been coinvestigator on the Yohkoh Soft X-ray Telescope and deputy principal investigator (science) on the Transition Region & Coronal Explorer. He specializes in the use of diagnostics derived from X-ray lines to characterize the temperature, emission measure, abundances, and dynamics of coronal plasmas to improve our understanding of active regions and how they evolve and produce flares. Dr. Strong served on the Sun-Earth Connection Roadmap

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