Resonant Acceleration of Magnetospheric Electrons Driven by the R--X Mode
XIAO Fu-Liang1, ZHENG Hui-Nan2, WANG Shui2
1Department of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076
2School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026
Resonant Acceleration of Magnetospheric Electrons Driven by the R--X Mode
XIAO Fu-Liang1;ZHENG Hui-Nan2;WANG Shui2
1Department of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076
2School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026
Abstract： An extended relativistic model is developed to evaluate the superluminous R--X-mode resonance especially the second-order and third-order resonances with electrons in the Earth’s magnetosphere. The potential for stochastic electron acceleration driven by the R--X mode is determined by the dispersive properties of the R--X mode and specifically the resonant harmonic N. In contrast to the limited acceleration at the first harmonic (1N=1) resonance, for the higher harmonic (N>1) resonances, the R--X mode is capable of accelerating electrons from ～10keV to ～ MeV energies, over a wide range of wave normal angles, in spatial regions extending from the auroral cavity to the latitude (>30°) outer radiation belt. This indicates that higher-order resonance is essentially important for the electron acceleration for the oblique wave propagation.
2005, Vol. 22 
