| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Counter-Streaming Interaction between Fast Magnetosonic Wave and Radiation Belt Electrons |
| ZHU Hui, SU Zhen-Peng, ZHENG Hui-Nan** |
CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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ZHU Hui, SU Zhen-Peng, ZHENG Hui-Nan 2013 Chin. Phys. Lett. 30 059401 |
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Abstract Fast magnetosonic (MS) waves have been suggested to be able to effectively accelerate radiation belt electrons. We present gyro-averaged test-particle simulations to investigate counter-streaming interaction between MS wave and radiation belt electrons. It is found that an MS wave can significantly scatter counter-streaming electrons through a non-resonant process. The corresponding energy diffusion coefficients for counter-streaming interaction are always comparable to those for co-streaming interaction, independent of wave normal angle. The pitch-angle and cross diffusion coefficients of counter-streaming interaction are much smaller than those of co-streaming interaction for small normal angles, while they become comparable for large normal angles. Moreover, the bounce-averaged diffusion coefficients exhibit quite different distribution from those for co-streaming or counter-streaming alone in the pitch-angle-energy space. These results suggest that the non-resonant effect associated with counter-streaming interaction is indispensable for the acceleration processes driven by an MS wave.
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Received: 13 December 2012
Published: 31 May 2013
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| PACS: |
94.20.wj
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(Wave/particle interactions)
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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94.30.Lr
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(Magnetic storms, substorms)
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94.30.Hn
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(Energetic trapped particles)
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