This book contains the lectures presented at the Advanced Study
Institute, 'Earth's Particles and Fields, 1969', which was held at the
University of California, Santa Barbara, during the period August 4
through 15, 1969. One hundred seventy persons from twelve different
countries attended the Institute. The authors and the publisher have
made a special effort for rapid publication of an up-to-date status of
the particles and fields in the earth's magnetosphere, which is an ever
changing research area. Special thanks are due to the lecturers for
their diligent preparation and excellent presentations. The individual
lectures and the published papers were deliberately limited; the
author's cooperation in conforming to these specifications is greatly
appreciated. The contents of the book are organized by subject area
rather than in the order in which papers were presented during the
Institute. Many thanks are due to Drs. Kinsey Anderson, Sam Bame,
Leverett Davis, Gilbert Mead, Harry Elliot, Kenneth Behannon, Reimar
Lust, A. W. Schardt, Carl-Gunne Eilthammar, and Martin Walt who served
as session chairmen during the Institute and contributed greatly to its
success by skillfully directing the discussion period in a stimulating
manner after each lecture. Dr. Martin Walt and the Summary Panel worked
hard to prepare an excellent summary of various aspects of particles and
fields in the magnetosphere at the end of the Institute.