Analytical approximation of transit time scattering due to magnetosonic waves
Abstract
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.
- Authors:
-
- Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA
- Department of Space Physics, School of Electronic Information Wuhan University Wuhan China
- Institute of Space Physics and Applied Technology Peking University Beijing China
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1402263
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 42 Journal Issue: 5; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Bortnik, J., Thorne, R. M., Ni, B., and Li, J. Analytical approximation of transit time scattering due to magnetosonic waves. United States: N. p., 2015.
Web. doi:10.1002/2014GL062710.
Bortnik, J., Thorne, R. M., Ni, B., & Li, J. Analytical approximation of transit time scattering due to magnetosonic waves. United States. https://doi.org/10.1002/2014GL062710
Bortnik, J., Thorne, R. M., Ni, B., and Li, J. Fri .
"Analytical approximation of transit time scattering due to magnetosonic waves". United States. https://doi.org/10.1002/2014GL062710.
@article{osti_1402263,
title = {Analytical approximation of transit time scattering due to magnetosonic waves},
author = {Bortnik, J. and Thorne, R. M. and Ni, B. and Li, J.},
abstractNote = {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.},
doi = {10.1002/2014GL062710},
journal = {Geophysical Research Letters},
number = 5,
volume = 42,
place = {United States},
year = {Fri Mar 13 00:00:00 EDT 2015},
month = {Fri Mar 13 00:00:00 EDT 2015}
}
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