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Title: Analytical approximation of transit time scattering due to magnetosonic waves

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2014GL062710· OSTI ID:1402263
 [1];  [1];  [2];  [3]
  1. Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA
  2. Department of Space Physics, School of Electronic Information Wuhan University Wuhan China
  3. Institute of Space Physics and Applied Technology Peking University Beijing China
+ Show Author Affiliations

Abstract Recent test particle simulations have shown that energetic electrons traveling through fast magnetosonic (MS) wave packets can experience an effect which is specifically associated with the tight equatorial confinement of these waves, known as transit time scattering. However, such test particle simulations can be computationally cumbersome and offer limited insight into the dominant physical processes controlling the wave‐particle interactions, that is, in determining the effects of the various wave parameters and equatorial confinement on the particle scattering. In this paper, we show that such nonresonant effects can be effectively captured with a straightforward analytical treatment that is made possible with a set of reasonable, simplifying assumptions. It is shown that the effect of the wave confinement, which is not captured by the standard quasi‐linear theory approach, acts in such a way as to broaden the range of particle energies and pitch angles that can effectively resonate with the wave. The resulting diffusion coefficients can be readily incorporated into global diffusion models in order to test the effects of transit time scattering on the dynamical evolution of radiation belt fluxes.

Sponsoring Organization:
USDOE
OSTI ID:
1402263
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 42 Journal Issue: 5; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

References (24)

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