| Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves |
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| 作者姓名： | 肖伏良 陈良旭 贺慧勇 周庆华 |
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| 作者单位： | [1]School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076 [2]State Key Laboratory of Space Weather, PO Box 8701, Beijing 100080 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 40774078, 40404012, 40474064 and 40674076, and the Visiting Scholar Foundation of State Key Laboratory for Space Weather, Chinese Academy Sciences. |
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| 摘 要： | We present a study on the second-order resonant interaction between the ring current protons with Whistler-mode waves propagating near the quasi electrostatic limit following the previous second-order resonant theory. The diffusion coefficients are proportional to the electric field amplitude E, much greater than those for the regular first-order resonance, which are proportional to the electric field amplitudes square E^2. Numerical calculations for the pitch angle scattering are performed for typical energies of protons Ek = 50 keV and 100 keV at locations L = 2 and L = 3.5. The timescale for the loss process of protons by the Whistler waves is found to approach one hour, comparable to that by the EMIC waves, suggesting that Whistler waves may also contribute significantly to the ring current decay under appropriate conditions.
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| 关 键 词： | 惠斯勒波 环电流 质子 二阶共振相互作用 |
| 收稿时间： | 2007-05-30 |
Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves |
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| XIAO Fu-Liang,CHEN Liang-Xu,HE Hui-Yong,ZHOU Qing-Hua.Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves[J].Chinese Physics Letters,2008,25(1):336-339. |
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| Authors: | XIAO Fu-Liang CHEN Liang-Xu HE Hui-Yong ZHOU Qing-Hua |
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| Affiliation: | School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076State Key Laboratory of Space Weather, PO Box 8701, Beijing 100080 |
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| Abstract: | We present a study on the second-order resonant interaction between the ring current protons with Whistler-mode waves propagating near the quasi electrostatic limit following the previous second-order resonant theory. The diffusion coefficients are proportional to the electric field amplitude E, much greater than those for the regular first-order resonance, which are proportional to the electric field amplitudes square E^2. Numerical calculations for the pitch angle scattering are performed for typical energies of protons Ek = 50 keV and 100 keV at locations L = 2 and L = 3.5. The timescale for the loss process of protons by the Whistler waves is found to approach one hour, comparable to that by the EMIC waves, suggesting that Whistler waves may also contribute significantly to the ring current decay under appropriate conditions. |
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| Keywords: | 94 20 Rr 52 35 Hr 94 30 Jp 94 20 Qq |
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