Second-Order Resonant Interaction of Ring Current Protons with Whistler-Mode Waves  

作　　者：肖伏良 陈良旭 贺慧勇 周庆华 

机构地区：[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

出　　处：《Chinese Physics Letters》2008年第1期336-339,共4页中国物理快报（英文版）

基　　金：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.

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.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.

关 键 词：PITCH-ANGLE DIFFUSION RADIATION BELT PROTONS COLLISIONLESS MAGNETIC RECONNECTION DUCTED PLASMASPHERIC HISS ION-CYCLOTRON WAVES ELECTRONS MAGNETOSPHERE ACCELERATION COEFFICIENTS STORMS 

分 类 号：O441[理学—电磁学]