Non-adiabatic Loss of Relativistic Electrons in the Outer Radiation Belt.

Details Non-adiabatic Loss of Relativistic Electrons in the Outer Radiation Belt. Non-adiabatic Loss of Relativistic Electrons in the Outer Radiation Belt.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm42a..02s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM42A-02

Physics

2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2774 Radiation Belts

Scientific paper

Wave-particle interactions may result in the loss of relativistic electrons in the outer radiation belt on timescales ranging from hours to weeks. Chorus waves, if present at high latitudes, may provide loss of hundreds of keV electrons on the timescale of minutes and MeV electrons on the timescale of a day. EMIC waves which are preferentially excited in the high density regions on the dusk-side of magnetosphere, may scatter relativistic electrons near the edge of the loss cone and produce very fast and localized losses. Our results indicate that relativistic electron lifetime is primarily determined by the pitch-angle scattering rates near the edge of the loss cone, which allows us to parameterize lifetime as a function of wave intensities, energy, and L-shell. Presented parameterizations may be used in particle tracing codes and radial diffusion codes which do not account for the violation of the first and second adiabatic invariant. We also present radial diffusion modeling and comparison with CRRES and HEO observations, which indicate that during the main phase of a storm, outward radial diffusion may effectively decrease electron phase space density at L-values above 4-5.

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