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arXiv physics/0003099physics.plasm-phphysics.space-ph
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用快模MHD波对磁层中电子的快速加速

Rapid acceleration of electrons in the magnetosphere by fast-mode MHD waves

Danny Summers, Chunyu Ma

摘要:

在大磁暴期间,观测到内磁层中相对论电子通量的增强与超低频波有关联。增强可以在几个小时内进行。为了解释这种相对论电子的快速产生,我们研究了低频快模MHD波(这里是ULF波的假设形式)对电子的渡越时间加速机制。在模型中的加速时标的计算表明,在Pc 4到Pc 5频率范围内的快模波,通常观察到的波振幅10- 20 nT,可以加速种子电子的能量在几个小时的时间内的顺序MeV。

英文摘要:

During major megnetic storms, enhanced flux of relativistic electrons in the inner magnetosphere have been observed to correleated with ULF waves. The enhancements can take place over a period of several hours. In order to account for such a rapid generation of relativistic electrons, we examine the mechanism of transit-time acceleration of electrons by low-frequency fast-mode MHD waves, here the assumed form of ULF waves. Calcaulations of the acceleration timescales in the model show that fast-mode waves in the Pc4 to Pc5 frequency range, with typically observed wave amplitudes 10--20 nT, can accelerate the seed electrons to energies of order MeV in a period of a few hours.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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