A Detailed Look at Energetic Electron Dynamics in Response to Solar Wind Drivers at GPS Orbit

Details A Detailed Look at Energetic Electron Dynamics in Response to Solar Wind Drivers at GPS Orbit A Detailed Look at Energetic Electron Dynamics in Response to Solar Wind Drivers at GPS Orbit

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1598f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1598

Physics

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

Scientific paper

Los Alamos National Laboratory flies 9 identical energetic particle instruments on the GPS constellation, yielding unprecedented temporal and spatial resolution in the the outer radiation belt from L=4 outwards - 1-hour time resolution and 0.1 L-resolution in the closed field line region. This allows us for the first time to perform 2-D superposed epoch analyses in this region, extending the much studied geosynchronous region down to L=4 and outwards to the trapping boundary. We present here results from these studies showing that the centre of the radiation belt is dynamic to timescales of hours for both energetic electron loss and energization processes. First results of a study of rapid particle loss signatures during quiet or weakly distrubed periods show these events to be related to solar wind stream interfaces, enhanced solar wind pressure prior to the loss and elevated levels of Kp, suggesting that a combination of magnetopause shadowing creating steep outward phase space density gradient wtogether with enhanced outward diffusion as the likely cause for these loss events - putting into question the efficency of wave-particle interaction processes that have recently been used to explain fast partcle losses in the radiation belts.

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