| Original Articles |
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Energetic Electron Pitch Angle Diffusion due to Whistler Wave during Terrestrial Storms |
| XIAO Fu-Liang1,2;HE Hui-Yong1 |
| 1Department of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076
2Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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XIAO Fu-Liang, HE Hui-Yong 2006 Chin. Phys. Lett. 23 267-270 |
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Abstract A concise and elegant expression of cyclotron harmonic resonant quasi-pure pitch-angle diffusion is constructed for the parallel whistler mode waves, and the quasi-linear diffusion coefficient is prescribed in terms of the whistler mode wave spectral intensity. Numerical computations are performed for the specific case of energetic electrons interacting with a band of frequency of whistler mode turbulence at L approx 3. It is found that the quasi-pure pitch-angle diffusion driven by the whistler mode scatters energetic electrons from the larger pitch-angles into the loss cone, and causes pitch-angle distribution to evolve from the pancake-shaped before the terrestrial storms to the flat-top during the main phase. This probably accounts for the quasi-isotropic pitch-angle distribution observed by the combined release and radiation effects satellite spacecraft at L approx 3.
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| Keywords:
94.20.Rr
52.35.Hr
94.20.Qq
94.30.Lr
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Published: 01 January 2006
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| PACS: |
94.20.Rr
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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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94.20.Qq
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(Particle precipitation)
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94.30.Lr
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(Magnetic storms, substorms)
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