Unusual wave activity near interplanetary shocks

Details Unusual wave activity near interplanetary shocks Unusual wave activity near interplanetary shocks

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..393t&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 393

Physics

1

Planetary Bow Shocks, Interplanetary Shocks, Solar Wind Plasma, Sources Of Solar Wind, Electrostatic Waves And Oscillations, Shock Waves And Discontinuities

Scientific paper

It has been reported that quasiparallel (Q∥) shocks are generally characterized by hours of upstream ion-acoustic-like wave activity and that quasiperpendicular (Q⊥) shocks show only minimal upstream wave activity. However, many exceptions to these trends have been observed by the ULYSSES Unified Radio and Plasma wave (URAP) Experiment near interplanetary shocks. These exceptions include: (1) Q⊥ shocks with extended periods of high-frequency ion-acoustic-like wave activity in the upstream regions and (2) Q∥ shocks with minimal wave activity upstream. Moreover, the peak amplitudes of the upstream, transition and downstream ion-acoustic-like waves are not highly correlated with the angle between the magnetic field and the shock normal, θBn. These observations do not indicate any systematic difference in the ion-acoustic-like wave activity associated with Q⊥ and Q∥ shocks. The implications of the present observations for the generally accepted scenarios of upstream wave and particle phenomena and the theories of the origin of diffuse ion distributions are discussed.

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