Relativistic Electron Precipitation During Geomagnetic Storms

Details Relativistic Electron Precipitation During Geomagnetic Storms Relativistic Electron Precipitation During Geomagnetic Storms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm52a..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM52A-07

Other

2716 Energetic Particles, Precipitating, 2730 Magnetosphere: Inner, 2788 Storms And Substorms

Scientific paper

The behavior of the relativistic(exceeding 0.5MeV) electron fluxes in the outer radiation zone during geomagnetic storms constitutes an important problem in magnetospheric physics. While the main phase depletion of relativistic electrons has been described in terms of an adiabatic response(conserving all three adiabatic invariants) to magnetospheric magnetic field decreases,as monitored by the Dst index,it is becoming clear that other physical mechanisms including electron precipitation also contribute to the depletion. Here,we examine the process of pitch-angle scattering by electron resonance with electromagnetic ion cyclotron(EMIC) waves as the cause of precipitation of relativistic electrons during storms. We calculate the relevant cyclotron-resonant pitch-angle diffusion coefficients under storm conditions. The coefficients depend on the EMIC wave frequency band,the ion composition,and the ratio of the electron gyrofrequency to the plasma frequency.Significant electron precipitation, corresponding to strong diffusion,is found to occur,for observed stormtime EMIC wave amplitudes of 1-10nT,during the sudden commencement,as well as the main and recovery phases,of a typical storm.

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