Seasonal Variation of MeV Electron Flux at Geosynchronous Orbit

Details Seasonal Variation of MeV Electron Flux at Geosynchronous Orbit Seasonal Variation of MeV Electron Flux at Geosynchronous Orbit

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm33a1111o&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM33A-1111

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Recent detailed observations of the outer belt MeV electrons by many satellites revealed the dependence of rebuilding location of the outer radiation belt on the magnitude of the storms; i.e. the location of the newly appeared outer belt is inversely proportional to the storm bigness. An interesting observation is the simultaneous appearance of intense whistler mode chorus emissions around the peak position of MeV electron flux. Puzzling aspect of the increase of MeV electrons is the increase around the geosynchronous orbit during non-storm-time period. The increase of MeV electrons has close relationship with the plasma wave activity. Supply of intermediate-energy electrons is evident, corresponding to the substorm injections. These seed electrons are likely accelerated by the waves to MeV energy range. Well known phenomena of the increase of the relativistic electron flux around the geosynchronous orbit is the dependence on the solar wind velocity. We have newly found that increase of the MeV electron flux strongly depends on the IMF polarity. In the autumn season the electron flux increases very much during away polarity, while in the spring season the electron flux increases very much during toward polarity. Observations by the Japanese DRTS satellite are largely consistent with so-called Russell- McPheron effect, in which the substorm activity depends on the IMF polarity especially in spring and autumn seasons. We will compare the MeV electron data at geosynchronous orbit with the data from MDS-1 satellite, which has a geosynchronous transfer orbit, to consider outer radiation belt dynamics from the magnetic activity point of view.

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