Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere

Details Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73...88x&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 1, p. 88-94.

Physics

2

Scientific paper

In this study, we present a first evaluation of bounce-averaged diffusion coefficients of superluminous wave (R-X and L-O) modes at two locations: L=6.5 and 4.5. We show that, analogous to the local diffusion coefficients, bounce-averaged momentum diffusion coefficients play a dominant role for pitch angles α above a critical angle αc, namely, >||>. We also demonstrate that for a Gaussian distribution of wave normal angle θ (X=tanθ), diffusion coefficients are sensitively dependent on the peak Xm. As Xm increases, and are found to increase in cases of interest: Xm=tan25∘, tan45∘ and tan65∘. We have estimated wave amplitudes for particular stochastic acceleration timescale for 1 MeV electrons and found that the required wave amplitudes Bte˜86 to ˜170pT for a timescale τ=1day. These results indicate that superluminous wave modes may have a significant potential for both stochastic acceleration of trapped electrons (with higher pitch angles) and loss process of untrapped electrons (with smaller pitch angles).

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