Plasma wave levels and IMF orientations preceding observations of interplanetary shocks by ISEE-3

Details Plasma wave levels and IMF orientations preceding observations of interplanetary shocks by ISEE-3 Plasma wave levels and IMF orientations preceding observations of interplanetary shocks by ISEE-3

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..668g&link_type=abstract

Geophysical Research Letters, vol. 9, June 1982, p. 668-671. Research supported by TRW, Inc.;

Other

6

Bow Waves, International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Plasma Interactions, Plasma Waves, Shock Wave Interaction, Noise Storms, Plasma Diagnostics, Solar Wind Velocity

Scientific paper

Some interplanetary shocks detected by ISEE-3 are preceded by many hours of strongly enhanced plasma wave noise at a few kHz, while others have essentially no wave precursors above background. It has been shown that these extremes correspond to quasi-parallel and quasi-perpendicular shocks, respectively, based on the instantaneous orientation angle of the interplanetary magnetic field (IMF) to the shock normal at the time the shocks cross the spacecraft. It is shown that precursor wave noise level is correlated with field orientation and an extrapolated instantaneous orientation angle throughout the preshock observation interval for two contrasting active and quiet cases, and that intermediate, variable noise levels correspond to intermediate, variable IMF orientations. It is inferred that foreshocks are an intrinsic part of the structure of quasiparallel interplanetary shocks.

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