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Title: Quasi-linear pitch angle diffusion and storm-time energetic electron precipitation from inner radiation belt
Authors: Prakash, Ram
Singh, A P
Agrawal, B M
Gupta, D D
Keywords: ELF/VLF hiss;Pitch angle diffusion;Scattering;Whistlers;Electron precipitation
Issue Date: Dec-2003
Publisher: NISCAIR-CSIR, India
Abstract: Pitch angle scattering and diffusion of inner belt electrons, interacting gyro-resonantly with wide-band whistler-mode ELF/VLF waves, are evaluated using quasi-linear theory in order to study the storm-time precipitation of energetic electrons from inner radiation belt. The calculated pitch angle scattering (being ~ 10-2-10-3 deg near the edge of loss cone) and lifetimes (hours and days only) indicate a significant electron precipitation into the lower atmosphere from the inner radiation zone. The results further hint that the calculated quasi-linear diffusion coefficients and pitch angle scattering both decrease with increasing equatorial pitch angle and approach a zero value at 90°. This provides a plausible explanation of the fact that farther the pitch angles from the loss cone, less efficient will be the diffusion of electrons into-the loss cone and that the electrons with large pitch angle near 90° are stably trapped in the inner zone.
Page(s): 337-343
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections: IJRSP Vol.32(6) [December 2003]

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