IMF Sector Control of the Relativistic Electrons at Geostationary Orbit

Details IMF Sector Control of the Relativistic Electrons at Geostationary Orbit IMF Sector Control of the Relativistic Electrons at Geostationary Orbit

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1574o&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1574

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Recent detailed observations of relativistic electron flux at geostationary orbit revealed that the relativistic electron flux increases very much when the solar wing velocity is high. It was also found that the relativistic electron increase has a strong seasonal dependence. In order to confirm this signature we have examined high energy particle data obtained by ETS-V (Engineering Test Satellite V) from November 1987 to September 1997 (10 years) and DRTS (Data Relay Testing Satellite) from its launch 2002 to now (more than 7 years). We found a good dependence of relativistic electron increase on the IMF sector polarity. By closer inspection, we identified that a large increase of relativistic electron flux took place during the toward sector in the spring season, while the increase took place during the away sector in the autumn. This is explained by so-called Russel-McPheron effect. We are speculating that substorm activity together with low frequency plasma wave activity make a significant contribution to the large increase of relativistic electron flux at geostationary orbit.

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