Pitch-Angle Scattering of Relativistic Electrons by Electromagnetic Ion Cyclotron Waves in the Magnetosphere

Details Pitch-Angle Scattering of Relativistic Electrons by Electromagnetic Ion Cyclotron Waves in the Magnetosphere Pitch-Angle Scattering of Relativistic Electrons by Electromagnetic Ion Cyclotron Waves in the Magnetosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51c0535l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM51C-0535

Physics

2716 Energetic Particles, Precipitating, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2772 Plasma Waves And Instabilities, 2778 Ring Current

Scientific paper

Electromagnetic ion cyclotron (EMIC) waves which propagate at frequencies near the proton gyrofrequency can interact with relativistic electrons in the outer radiation belt, through cyclotron resonance, and cause pitch-angle scattering. During magnetic storms EMIC wave amplitudes can exceed the level required for strong diffusion scattering and significant electron losses to the atmosphere can occur over many drift orbits. The Combined Release and Radiation Effects Satellite (CRRES) was ideally situated to observe EMIC waves in the middle magnetosphere. In this study observations from CRRES are used to obtain spectral properties of EMIC waves (1-10 nT), and thus determine typical pitch-angle diffusion coefficients, Dα α , during different phases of a storm. These diffusion rates are then compared to theoretical calculations assuming a simple functional form for Dα α based on quasi-linear theory that is valid for parallel propagating electromagnetic waves.

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