期刊
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
卷 71, 期 16, 页码 1647-1652出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2008.07.004
关键词
Pitch angle diffusion; Lifetime; Decay rate
资金
- Space Vehicles Directorate of the Air Force Research Laboratory
- NASA [NNX08AF34G, NNX06AB84G1]
- NASA [102292, NNX08AF34G] Funding Source: Federal RePORTER
We consider timescales on which particle distributions respond to pitch angle diffusion. On the longest timescale, the distribution decays at a single rate independent of equatorial pitch angle alpha(0), even though the diffusion coefficient, and the distribution itself, may vary greatly with alpha(0). We derive a simple integral expression to approximate this decay rate and show that it gives good agreement with the full expression. The roles of both the minimum and loss cone values of the diffusion coefficient are demonstrated and clarified. Published by Elsevier Ltd.
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