Nonlinear Coupling of Whistler Waves to Oblique Electrostatic Turbulence Enabled by Cold Plasma
Nonlinear Coupling of Whistler Waves to Oblique Electrostatic Turbulence Enabled by Cold Plasma
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DOI：
10.1063/5.0041838
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发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
V. Roytershteyn;G. Delzanno
中科院分区：
文献类型：
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作者：
V. Roytershteyn;G. Delzanno
哨声波是电磁等离子体模式，其频率在低杂波和电子回旋频率之间。哨声波以其特有的色散关系而闻名，在太阳风中经常被观测到，在地球磁层中无处不在。它们在后者的动力学中起着重要作用[1]，它们要么出现在“合唱”中，典型地在两个不同的波段中的离散发射，要么出现在“嘶嘶声”中，主要在等离子体中发现的宽带发射。合唱波与高能粒子的局部扩散以及以扩散和脉动极光或微暴流形式出现的电子沉淀有关。观测表明，地球磁层中的哨声波可以达到很大的振幅。
Whistler waves are electromagnetic plasma modes with frequency between the lower hybrid and the electron cyclotron frequency. Famous for their characteristic dispersion relation, whistler waves are frequently observed in the solar wind and are ubiquitous in the Earth's magnetosphere. They play a major role in the dynamics of the latter [1] , where they appear either as "chorus", discrete emissions typically in two distinct bands, or "hiss", broadband emissions found predominantly in the plasmasphere. The chorus waves are associated with local energization of energetic particles as well as electron precipitation in the form of diffuse and pulsating aurora, or microbursts. Observations suggest that whistler waves in the Earth's magnetosphere can reach large amplitudes.