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Temporal evolution of relativistic electrons induced by fast magnetosonic waves in the radiation belts

机译:辐射带中快速磁声波诱导的相对论电子的时间演化

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We study the influence of fast magnetosonic (MS) waves on the temporal evolution of the phase space density (PSD) of relativistic electrons in the outer radiation belts. We evaluate the bounce-averaged pitch angle, momentum and cross-diffusion rates, and find that all the diffusion rates are most pronounced within a limited region of pitch angles: ~50°-70°. Consequently, numerical solutions of a 2D momentum-pitch angle diffusion equation show that significant increases in electron PSDs at energies of 1 MeV or above occur primarily within such a limited region of pitch angles. Moreover, neglecting cross-diffusion rates generally produces relatively large overestimates in the PSD evolution. The current results suggest that MS waves are primarily responsible for acceleration of relativistic (>1 MeV) electrons around relatively high pitch angles.
机译:我们研究了快速磁声(MS)波对外部辐射带中相对论电子的相空间密度(PSD)的时间演化的影响。我们评估了弹跳平均的俯仰角,动量和交叉扩散率,发现所有扩散率在俯仰角的有限区域内最明显:〜50°-70°。因此,二维动量-俯仰角扩散方程的数值解表明,在1 MeV或更高的能量下,电子PSD的显着增加主要发生在俯仰角的这种有限区域内。此外,忽略交叉扩散速率通常会在PSD演化中产生相对较大的高估。当前结果表明,MS波主要负责相对高俯仰角附近相对论(> 1 MeV)电子的加速。

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