Post-shock ULF Wave Activity Driven by Dynamic Pressure Variations

Details Post-shock ULF Wave Activity Driven by Dynamic Pressure Variations Post-shock ULF Wave Activity Driven by Dynamic Pressure Variations

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21b..09s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH21B-09

Physics

2139 Interplanetary Shocks, 2164 Solar Wind Plasma, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In this work we present analyses of events in which ULF wave activity was observed following the impact of an interplanetary shock. The transmission of compressional energy from the impact of such shocks on the magnetosphere has been postulated as a source for global cavity mode oscillations. We show that oscillations inside the magnetosphere following the shock passage are well correlated with oscillations of the solar wind dynamic pressure, a result unexpected from the cavity mode model. Rather than providing a broadband source of energy to the magnetospheric cavity, we suggest that the magnetospheric pulsations are directly driven by the dynamic pressure variations.

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