Observation of relativistic electron precipitation during a rapid decrease of trapped electron flux

Details Observation of relativistic electron precipitation during a rapid decrease of trapped electron flux Observation of relativistic electron precipitation during a rapid decrease of trapped electron flux

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm32a..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM32A-02

Physics

2716 Energetic Particles: Precipitating, 2774 Radiation Belts, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Rapid depletions of the trapped electron flux are often observed, and illustrate the important role played by losses in controlling electron variability in the radiation belts. The observed decrease may be partly due to adiabatic effects, but some of the electrons are lost either through magnetopause shadowing or through precipitation into Earth's atmosphere. On January 19, 2000, duskside precipitation was observed near the start of a rapid flux depletion event, during a period of magnetic field stretching in the tail. The observations were made with the germanium spectrometer on the MAXIS balloon payload and show that real losses were occurring during the initial decrease which has previously been attributed to purely adiabatic effects. A quantitative comparison of the precipitation rate with the change in electron flux measured at GPS implies that only ~1% of the loss cone was filled, however, precipitation alone is sufficient to account for the flux decrease if it extended over 2-3 hours of local time. We present these results and compare the observed loss rate with the theoretical loss rate expected for pitch-angle scattering by EMIC waves.

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