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《Plasma Science and Technology》 2009年05期
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Effect of Chorus Latitudinal Distribution on Evolution of Outer Radiation Belt Electrons

肖伏良  李君求  唐立军  贺艺华  厉江帆  
【摘要】:正 Primary result on the impact of the latitudinal distribution of whistler-mode chorusupon temporal evolution of the phase space density (PSD) of outer radiation belt energetic elec-trons was presented. We evaluate diffusion rates in pitch angle and momentum due to a band ofchorus frequency distributed at a standard Gaussian spectrum, and solve a 2-D bounce-averagedmomentum-pitch-angle Fokker-Planck equation at L = 4.5. It is shown that chorus is effective inaccelerating electrons and can increase PSD for energy of 1 MeV by a factor of 10 or more inabout one day, which is consistent with observation. Moreover, the latitudinal distribution of cho-rus has a great impact on the acceleration of electrons. As the latitudinal distribution increases,the efficient acceleration region extends from higher pitch angles to lower pitch angles, and evencovers the entire pitch angle region when chorus power reaches the maximum latitude λ_m = 45°.

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