Estimates of lifetimes against pitch angle diffusion

Details Estimates of lifetimes against pitch angle diffusion Estimates of lifetimes against pitch angle diffusion

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1647a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 16, p. 1647-1652.

Physics

15

Pitch Angle Diffusion, Lifetime, Decay Rate

Scientific paper

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.

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