Acceleration and Losses of Relativistic Radiation Belt Electrons Due to Wave-Particle Interactions: SCATHA Observations

Details Acceleration and Losses of Relativistic Radiation Belt Electrons Due to Wave-Particle Interactions: SCATHA Observations Acceleration and Losses of Relativistic Radiation Belt Electrons Due to Wave-Particle Interactions: SCATHA Observations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm14b..02r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM14B-02

Physics

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Various mechanisms have been proposed as the cause of acceleration and losses of radiation belt electrons in the inner magnetosphere. These include radial diffusion influenced by ULF pulsations, and interactions with several types of low frequency plasma waves such as whistler-mode chorus emissions. Present models idealize these effects as quasilinear diffusion of the particles in energy and/or pitch angle. The P78-2 SCATHA satellite is one of the few missions to simultaneously measure both the energetic electrons and plasma waves. The SCATHA energetic electron observations are analyzed to provide insights into these phenomena. Profiles of the electron phase space density at constant values of the first two adiabatic invariants are constructed for several storm-time intervals. These profiles are examined for the signatures of local processes such as pitch angle diffusion. The evolution of the phase space density is analyzed with the concurrent observations of whistler-mode chorus wave intensity by SCATHA. These amplitudes are used to compute model quasilinear diffusion coefficients which are then compared with the observed gradients in electron phase space.

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