Identifying Loss Mechanism of Radiation Belt Electrons During Flux Dropout Events

Details Identifying Loss Mechanism of Radiation Belt Electrons During Flux Dropout Events Identifying Loss Mechanism of Radiation Belt Electrons During Flux Dropout Events

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1591h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1591

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

This work determines the relative importance of loss mechanisms that control the rapid electron flux dropouts at geosynchronous orbit, namely, drift magnetopause losses and precipitation by wave-particle interaction. Multi-spacecraft measurements, e.g., GOES, LANL, and THEMIS satellites, provide simultaneous particle and wave data at various radial distances and local times which improves our understanding of the variability of the inner magnetosphere on a global scale. We focus on relativistic electron dropout events during small to moderate activity because the solar wind condition and magnetospheric response are much less complex than during storm times. By interpreting the particle data using magnetospheric configurations predicted by the Tsyganenko model, we determine the possibility of drift magnetopause losses as the cause of electron dropouts. Comparing the wave power calculated from high time resolution magnetic field data, we quantify the role of precipitation induced by wave-particle interaction during the events. Finally, we characterize the preferential solar wind and IMF conditions for electron dropout events with these two loss mechanisms.

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