| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Chorus-Driven Outer Radiation Belt Electron Dynamics at Different L-Shells |
| ZHANG Sai1,2, XIAO Fu-Liang2**
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1Hunan Science and Technology Industrial Vocational and Technical College, Xiangtan 411207
2School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410004
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| Cite this article: |
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ZHANG Sai, XIAO Fu-Liang 2010 Chin. Phys. Lett. 27 129401 |
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Abstract Energetic outer radiation belt electron phase space density (PSD) evolution due to interaction with whistler-mode chorus at different L−shells is investigated by solving the diffusion equation including cross diffusion terms. It is found that the difference of diffusion rates for different L−shells occurs primarily at pitch angles 0°–50° and around 90°. In particular, diffusion rates for L=6.5 are found to be 5–10 times larger than that for L=3.5 at these pitch angles. In the presence of cross terms, PSD for ∼ MeV electrons after 24 h decreases by about 25, 12, 10 and 8 times at L=3.5, 4.5, 5.5 and 6.5 near the loss cone, and increases by about 55, 45, 30 and 20 times at larger pitch angles, respectively. After 24 h, the ratios between ∼ MeV electron PSDs from simulations without and with cross diffusion at L=3.5, 4.5, 5.5 and 6.5 are about 350, 600, 800 and 800 near the loss cone, and become 5, 5.5, 6.5 and 8 at pitch angle 90°, respectively. These results demonstrate that neglect of cross diffusion generally results in the overestimate of PSD, and the cross diffusion plays a more significant role in the resonant interaction between chorus waves and outer radiation belt electrons at larger L.
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| Keywords:
94.20.wj
52.35.Hr
94.20.wc
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Received: 16 July 2010
Published: 23 November 2010
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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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94.20.wc
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(Plasma motion; plasma convection; particle acceleration)
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