Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves
XIAO Fu-Liang1,2, CHEN Liang-Xu1, HE Hui-Yong1, ZHOU Qing-Hua1
1School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 4100762State Key Laboratory of Space Weather, PO Box 8701, Beijing 100080
Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves
1School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 4100762State Key Laboratory of Space Weather, PO Box 8701, Beijing 100080
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 E2. Numerical calculations for the pitch angle scattering are performed for typical energies of protons Ek=50keV and 100keV 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.
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 E2. Numerical calculations for the pitch angle scattering are performed for typical energies of protons Ek=50keV and 100keV 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.
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]. 中国物理快报, 2008, 25(1): 336-339.
XIAO Fu-Liang, CHEN Liang-Xu, HE Hui-Yong, ZHOU Qing-Hua. Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves. Chin. Phys. Lett., 2008, 25(1): 336-339.
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2008, Vol. 25 
