Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 71, Issue 16, Pages 1647-1652Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2008.07.004
Keywords
Pitch angle diffusion; Lifetime; Decay rate
Funding
- Space Vehicles Directorate of the Air Force Research Laboratory
- NASA [NNX08AF34G, NNX06AB84G1]
- NASA [102292, NNX08AF34G] Funding Source: Federal RePORTER
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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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