Plasma sheet electrons, plasmasphere, and whistler mode waves during high-speed stream events

Details Plasma sheet electrons, plasmasphere, and whistler mode waves during high-speed stream events Plasma sheet electrons, plasmasphere, and whistler mode waves during high-speed stream events

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm24a..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM24A-01

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2764] Magnetospheric Physics / Plasma Sheet, [2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

We report average profiles of plasma sheet electrons, plasmasphere, and VLF waves during high-speed stream events with predominantly southward and northward interplanetary magnetic field (IMF). Long-term in-situ data obtained from Akebono and NOAA/POES are used for this analysis. Continuous hot electron injections are enhanced during a prolonged period of intense convection and/or substorms, which are driven by the southward IMF in high-speed streams. The enhanced convection keeps the plasmapause location relatively close to the Earth for a few days during high-speed streams and fp/fc becomes relatively small outside of the plasmasphere to efficiently excite whistler mode waves. In fact, such a continuous enhancement of whistler mode waves is observed during the period of high-speed streams with southward IMF. On the other hand, there are little injections of hot electrons from the plasma sheet during the high-speed streams with northward IMF. The plasmapause location is relatively far from the Earth and little VLF activity is observed. All of these different responses to the high-speed streams with southward and northward IMF are consistent with the unified scenario that the whistler-wave particle interaction is an essential process to generate the outer belt electrons.

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