Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 73, Issue 1, Pages 106-111Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2010.01.007
Keywords
Wave-particle interaction; Ring current protons; Precipitation loss; EMIC waves
Funding
- National Natural Science Foundation of China [40931053, 40874076, 40925014, 40774079]
- Special Fund for Public Welfare Industry (meteorology) [GYHY200806024]
- Changsha University of Science and Technology
- Specialized Research Fund for State Key Laboratories for Space Weather
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We examine the precipitation loss of ring current protons produced by the electromagnetic ion cyclotron (EMIC) waves at the location L=3.5 where the symmetrical ring current primarily occurs. Using a recently introduced hybrid finite difference (HFD) method, we solve the standard Fokker-Planck diffusion equation with incorporation of the cross diffusion terms that were often ignored in the previous work. We show that EMIC waves can produce efficient pitch angle scattering of energetic (tens of key) protons, yielding a rapid decrement in the flux with a time scale of a few hours, consistent with observational data. We also demonstrate that omission of the cross diffusion terms generally overestimates the decrement in the flux, typically by a factor of similar to 2 after a few hours at lower pitch angles, suggesting that the cross terms also play an important role in precipitation loss of ring current protons. (C) 2010 Elsevier Ltd. All rights reserved.
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