Upstream particles observed in the Earth's foreshock region

Details Upstream particles observed in the Earth's foreshock region Upstream particles observed in the Earth's foreshock region

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980iowa.rept.....e&link_type=abstract

Progress Report, 1977 - 1978 Iowa Univ., Iowa City. Dept. of Physics and Astronomy.

Physics

Earth Magnetosphere, Electrostatic Waves, Particle Collisions, Solar Wind, Electromagnetic Wave Transmission, Ion Beams, Ion Density (Concentration), Ion Distribution, Plasmas (Physics)

Scientific paper

Based primarily on an extensive study of fully three dimensional plasma data, we describe the interrelationships of the upstream particles and plasma waves observed in the Earth's foreshock region. The Univ. of Iowa LEPEDEAs detect ions and electrons from 1 eV to 45 keV over all except approx 2% of the unit sphere. Comparisons are made with high time resolution particle data obtained by the Univ. of Calif. (Berkeley) instruments and plasma wave data collected by the Univ. of Iowa plasma wave instruments on the two ISEE spacecraft. The presence of ion beams or dispersed ion distributions is found to be a sufficient condition for the presence of electrostatic and electromagnetic wave emissions. Detailed correlations of ions with plasma waves down to a tenth of an ion gyro-period indicate that ion-acoustic emission is enhanced when increased anisotropies and gyrophase organization are observed. Time aliasing effects limit the interpretation of velocity distributions taken within the foreshock region. High time resolution correlations between the different instruments, however, demonstrate that time variations of a single isotropic or anisotropic distribution cannot produce the dispersed ion distributions.

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