The multiple flybys described in this paper will undoubtedly continue to contribute results of great scientific value but additional, long-awaited data will soon become available. The primary mission of Ulysses has begun; the exploration of the solar wind above the poles of the sun promises to provide answers and generate new mysteries. Galileo, although impaired by the loss of its high gain antenna, will provide unparalleled coverage of the near-satellite environments for all of the Galilean moons of Jupiter; it will monitor Jupiter's gargantuan magnetosphere for thousands of rotation periods, moving deep down the center of the magnetotail to unexplored regions. For many who have waited for more than a decade (the original encounter date for Galileo was in 1984), it is gratifying to anticipate that the next quadrennial report should, at long last, include descriptions of Galileo's findings at Jupiter.
Acknowledgments. The contributions of Krishan K. Khurana, Zhi Wang, and Raymond J. Walker to the analysis and ideas put forward in this paper are gratefully acknowledged. Alexis Prevost provided invaluable assistance in the analysis of the Earth2 shock encounters. This work was partially supported by the Jet Propulsion Laboratory under contract 958694. (Received June 24, 1994; revised version: October 31, 1994). UCLA Institute of Geophysics and Planetary Physics Publication Number 4184.