Margaret Kivelson

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"After a Ph.D. in theoretical physics (with Nobel Prize winner Julian Schwinger) and part-time work at the RAND Corporation during her children's early childhood, Margaret Kivelson entered geophysics in the 1960s. Since then, Margaret has led a remarkable career in the fields of solar-terrestrial physics, heliospheric and planetary science, and, in particular, planetary magnetism. Her achievements include the following.

"In the 1970s, being involved in the first definitive in situ measurements of solar-terrestrial coupling showing magnetic reconnection was fundamental, developing the best codification of the Pioneer spacecraft Jovian magnetic field measurements, and laying the foundations of a better understanding of how magnetospheric convection feeds Earth's energetic particle belts. In the 1980s, picking up the challenge to develop a magnetometer for the Galileo mission to the Jupiter system, developing an understanding of terrestrial ULF [Ultra-low frequency] pulsations, and working on the interaction of small bodies with the solar wind.

"In the 1990s, triumphantly leading the Galileo team to a series of astounding discoveries, particularly about the varied magnetic behavior of the Galilean satellites.

"In the past 10 years, the scientific harvest of Galileo has been great, and Margaret's part in it has been very large. She has been responsible, through the measurements made by her instrument, for the most surprising and challenging results from the mission. Her discoveries concerning the magnetic fields and the magnetized environments of Jupiter's Galilean moons, Io, Europa, Ganymede, and Callisto, are going to be seminal references in planetary science.

"No planetary scientist would have predicted that the major and unexpected differences in the magnetic fields of each of the moons would be perhaps the most extraordinary of the harvest of results returned by Galileo. Her scientific leadership was required and tested to the full to overturn some of the very strong initial objections. But now our view of the formation of the moons has to change. The discovery of the intrinsic field of Ganymede would have been a discovery alone, enough to etch her name in history. However, the implications of her work in deducing the existence of magnetic induction signals at Europa and implying thereby a liquid ocean below the ice of Europa have gained her media attention worldwide, and deservedly so. As a renaissance scientist, Galileo and his telescope changed the way we view Jupiter and the universe. On the mission named for him, Margaret's repertoire of theory, observation, modeling, and data analysis has revolutionized our view of the Galilean moons

"Margaret has educated and inspired many students and colleagues. In her role as educator and scientist, there are few who can match her skill to transform complicated physical ideas into mathematics, and mathematical equations into beautifully crafted prose. Most remarkable, for someone whose scientific genius is such that she could have justifiably focused on her own pursuits, is her continual willingness to find time to work on behalf of other, more junior scientists. Often, but certainly not exclusively, these are female scientists, for whom she has been an extraordinary role model and mentor. For these contributions, and for her scientific achievements and leadership, it is an honor to present Margaret Kivelson with the John Adam Fleming Medal."

—HOWARD J. SINGER, U.S. National Oceanic and Atmospheric Administration, Boulder, Colo.

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