Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1805c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1805-1808.
Physics
18
Electron Plasma, Pioneer Venus 1 Spacecraft, Plasma Oscillations, Plasma Waves, Solar Wind, Venus Atmosphere, Bow Waves, Interplanetary Magnetic Fields, Plasma Frequencies, Shock Waves
Scientific paper
Plasma waves are observed in the solar wind upstream of the Venus bow shock by the Pioneer Venus Orbiter. These wave signatures occur during periods when the interplanetary magnetic field through the spacecraft position intersects the bow shock, thereby placing the spacecraft in the foreshock region. The electron foreshock boundary is clearly evident in the data as a sharp onset in wave activity and a peak in intensity. Wave intensity is seen to drop rapidly with increasing penetration into the foreshock. The peak wave electric field strength at the electron foreshock boundary is found to be similar to terrestrial observations. A normalized wave spectrum was constructed using measurements of the electron plasma frequency and the spectrum was found to be centered about this value. These results, along with polarization studies showing the wave electric field to be field aligned, are consistent with the interpretation of the waves as electron plasma oscillations.
Crawford Gregory Kim
Russell Christopher T.
Strangeway Robert J.
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