A Statistical Study of Lower Hybrid Waves in the Earth's Magnetosphere by Van Allen Probes
A Statistical Study of Lower Hybrid Waves in the Earth's Magnetosphere by Van Allen Probes
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DOI：
10.1029/2021gl093168
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发表时间：
2021-05
影响因子：
5.2
通讯作者：
Xu Liu;Lunjin Chen;Q. Ma
中科院分区：
文献类型：
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作者：
Xu Liu;Lunjin Chen;Q. Ma
低杂化（LH）波是在LH共振频率附近的静电发射。它们垂直传播的小波长与热粒子的拉莫尔半径相当，并且能够加热离子和电子。在本研究中，我们利用2012 - 2018年的范艾伦探测器观测数据，统计研究了内磁层LH波的全球分布。我们发现(a) LH波在磁层内普遍存在。大多数LH波被限制在磁赤道附近，典型振幅为0.02-0.2 mV/m，发生率高达10%。(b)随着AE*的增大，LH波向内L区扩展，振幅增大。(c)弱LH波发生在等离子体顶内的夜侧。中等和强烈的LH波发生在等离子体顶的夜间和中午。随着AE*的增加，它们延伸到等离子体顶内的所有磁地方时和等离子体顶外的黎明边。
The lower hybrid (LH) waves are electrostatic emissions near the LH resonant frequency. They propagate perpendicularly with a small wavelength comparable to Larmor radius of thermal particles and can be capable of heating both ions and electrons. In this study, we statistically study the global distribution of LH waves in the inner magnetosphere by using Van Allen Probes observation from 2012 to 2018. We find that (a) LH waves are commonly observed in the inner magnetosphere. Most LH waves are confined near the magnetic equator with typical amplitudes of 0.02–0.2 mV/m and occurrence rates up to 10%. (b) LH waves extend to inner L regions with increasing wave amplitudes as AE* increases. (c) Weak LH waves occur at the nightside inside the plasmapause. Moderate and strong LH waves occur at the nightside and noon inside the plasmapause. As AE* increases, they extend to all magnetic local times inside the plasmapause and dawnside outside the plasmapause.