Characteristics of Duskside Relativistic Electron Precipitation measured with SAMPEX

Details Characteristics of Duskside Relativistic Electron Precipitation measured with SAMPEX Characteristics of Duskside Relativistic Electron Precipitation measured with SAMPEX

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm22a..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM22A-07

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

We will present spectral data from the Proton/Electron Telescope (PET) on SAMPEX that show relativistic electron precipitation with the hardest spectra concentrated in the dusk sector, as observed with a much smaller data set from balloons (Duskside Relativistic Electron Precipitation, or DREP). This is roughly consistent with the favored model of scattering by electromagnetic ion cyclotron (EMIC) waves as the precipitation mechanism. To further test the EMIC wave hypothesis, we compare the local-time distribution of the SAMPEX DREPs with the distribution of EMIC waves studied with GOES at geosynchronous orbit and find a significant shift between the two local time peaks. This statistical comparison is complementary to case studies that show, e.g., DREP occurring simultaneously with proton precipitation, in support of the EMIC hypothesis. We will also show IMAGE EUV data giving the plasmaspheric density at the times and locations of SAMPEX DREP events, testing the expectation that the DREP correspond to enhanced densities (strong plumes) relative to randomly-selected times. Finally, we will show the distribution of the timing of DREP relative to geomagnetic storms and the dependence of the probability of DREP on Kp and the phase of the solar cycle.

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