Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm32a..04s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM32A-04
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Quantifying the processes governing the transport, acceleration and loss of radiation belt electrons is a current challenge in magnetospheric physics.Here we study the process of radiation belt electron loss to the atmosphere due to resonant pitch-angle scattering by plasma waves. Radiation belt electrons are subject to pitch-angle scattering by whistler-mode chorus outside the plasmasphere, and by both whistler-mode hiss and EMIC waves inside the plasmasphere(or in drainage plumes).Our calculations show that the electron precipitation loss timescale due to scattering by each of the wave modes,chorus,hiss,and EMIC waves,can be one day or less. These wave modes can separately, or in combination, contribute significantly to the depletion of relativistic (MeV) electrons from the outer zone over the course of a magnetic storm. Efficient pitch-angle scattering by whistler-mode chorus or hiss typically requires high-latitude waves.Timescales for electron loss generally depend on the spectral properties of the waves,as well as the background electron number density and magnetic field. Loss timescales due to EMIC wave scattering depend also on the ion composition of the plasma. A complete analysis of non-adiabatic loss of radiation belt electrons requires consideration of additional processes such as losses due to radial diffusion and magnetopause shadowing.
Meredith Nigel P.
Ni Binbin
Summers Donald
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