哨声波的静电陡化
Electrostatic steepening of whistler waves
摘要：
我们提出了令人惊讶的观察，由美国宇航局范艾伦探测器宇宙飞船的哨声波与大量的电场功率在谐波的哨声波基频。谐波处的波功率是由于非线性陡峭的哨声静电场，这在双温电子等离子体中由于哨声波耦合到电声模而成为可能。模拟和分析估计表明，陡峭化需要几十毫秒。到较高频率的流体动力学能量级联促进从回旋共振电子（驱动哨声波）到较低能量电子的有效能量转移。
英文摘要：
We present surprising observations by the NASA Van Allen Probes spacecraft of whistler waves with substantial electric field power at harmonics of the whistler wave fundamental frequency. The wave power at harmonics is due to nonlinearly steepened whistler electrostatic field that becomes possible in the two-temperature electron plasma due to whistler wave coupling to the electron-acoustic mode. The simulation and analytical estimates show that the steepening takes a few tens of milliseconds. The hydrodynamic energy cascade to higher frequencies facilitates efficient energy transfer from cyclotron resonant electrons, driving the whistler waves, to lower energy electrons.
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