Generation of High-frequency Whistler Waves in the Earth’s Quasi-perpendicular Bow Shock
Generation of High-frequency Whistler Waves in the Earth’s Quasi-perpendicular Bow Shock
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地球准垂直弓形激波中高频惠斯勒波的产生
DOI：
10.3847/2041-8213/ac2748
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
S. Bale
中科院分区：
文献类型：
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作者：
B. Page;I. Vasko;A. Artemyev;S. Bale
我们使用观测磁层多尺度航天器，以确定一个自由能源的高频哨声波在地球的准垂直弓冲击。在所考虑的测量中，哨声传播平行和反平行的背景磁场B 0的频率约为100 Hz（0.15 f ce，其中f ce是电子回旋频率）和幅度在0.1和1 nT之间。它们的生长可以归因于电子速度分布函数中的局部螺距角各向异性，这不能通过宏观参数如热通量或温度各向异性来精确描述。然而，沿着沿着-B 0的热通量的存在确实为在该方向上传播的高频哨声波创造了优先条件。这些波部分地指向冲击，这意味着它们可以散射从冲击中流出的电子。这缩短了电子在冲击过渡区中所花费的时间，从而促进了电子击穿。
We use observations from the Magnetospheric Multiscale spacecraft to identify a free energy source for high-frequency whistler waves in the Earth’s quasi-perpendicular bow shock. In the considered measurements, whistlers propagate both parallel and antiparallel to the background magnetic field B 0 with frequencies around 100 Hz (0.15 f ce, where f ce is the electron cyclotron frequency) and amplitudes between 0.1 and 1 nT. Their growth can be attributed to localized pitch angle anisotropy in the electron velocity distribution function that cannot be precisely described by macroscopic parameters like heat flux or temperature anisotropy. However, the presence of heat flux along − B 0 does create preferential conditions for the high-frequency whistler waves that propagate in this direction. These waves are directed partially toward the shock, meaning they can scatter electrons that are streaming from the shock. This prolongs the time the electrons spend in the shock transition region and thereby promotes electron energization.
地球弓激波中的静电孤立波：性质、特性、寿命和起源
DOI：
10.1029/2021ja029357
发表时间：
2021
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
作者：
Wang, R.;Vasko, I. Y.;Mozer, F. S.;Bale, S. D.;Kuzichev, I. V.;Artemyev, A. V.;Steinvall, K.;Ergun, R.;Giles, B.;Khotyaintsev, Y.
通讯作者：
Khotyaintsev, Y.
惠斯勒热通量不稳定性的非线性演化
DOI：
10.3847/1538-4357/ab3290
发表时间：
2019
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Kuzichev, Ilya V.;Vasko, Ivan Y.;Soto-Chavez, Angel Rualdo;Tong, Yuguang;Artemyev, Anton V.;Bale, Stuart D.;Spitkovsky, Anatoly
通讯作者：
Spitkovsky, Anatoly