C. M. Hammond and M. G. Kivelson
Department of Earth and Space Sciences and
Institute of Geophysics and Planetary Physics
University of California, Los Angeles
R.
J. Walker
Institute of Geophysics and Planetary Physics
University of California, Los Angeles
EOS Trans., 1993
Accepted for publication in EOS Transactions
Copyright © 1993 by the American Geophysical Union
Further electronic distribution is not allowed.