Nonlinear electron acceleration by oblique whistler waves: Landau resonance vs. cyclotron resonance
Nonlinear electron acceleration by oblique whistler waves: Landau resonance vs. cyclotron resonance
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DOI：
10.1063/1.4836595
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发表时间：
2013-12-01
影响因子：
2.2
通讯作者：
Krasnoselskikh, V. V.
中科院分区：
文献类型：
--
作者：
Artemyev, A. V.;Vasiliev, A. A.;Krasnoselskikh, V. V.
本文主要研究相对论电子与高振幅强斜哨声在地球辐射带中的非线性相互作用。在一个简化的偶极磁场模型中，我们考虑了电子在朗道和基回旋共振中的俘获。捕获到朗道共振对应于电子赤道螺距角的减小，而捕获到第一回旋共振则增加了电子的赤道螺距角。对于100keV的电子，由于俘获而获得的能量在两个共振中是相似的。对于能量较小的电子，考虑朗道共振时，加速更为有效。此外，与基频共振相比，在更大的初始俯仰角和初始能量范围内都可以捕获到朗道共振。因此，我们可以得出结论，对于以准静电模式传播的强斜波，朗道共振通常比基波更重要。(C)2013 AIP出版有限责任公司。
This paper is devoted to the study of the nonlinear interaction of relativistic electrons and high amplitude strongly oblique whistler waves in the Earth's radiation belts. We consider electron trapping into Landau and fundamental cyclotron resonances in a simplified model of dipolar magnetic field. Trapping into the Landau resonance corresponds to a decrease of electron equatorial pitch-angles, while trapping into the first cyclotron resonance increases electron equatorial pitch-angles. For 100 keV electrons, the energy gained due to trapping is similar for both resonances. For electrons with smaller energy, acceleration is more effective when considering the Landau resonance. Moreover, trapping into the Landau resonance is accessible for a wider range of initial pitch-angles and initial energies in comparison with the fundamental resonance. Thus, we can conclude that for intense and strongly oblique waves propagating in the quasi-electrostatic mode, the Landau resonance is generally more important than the fundamental one. (C) 2013 AIP Publishing LLC.