EXPERIMENTAL DETERMINATION OF WHISTLER WAVE DISPERSION RELATION IN THE SOLAR WIND
EXPERIMENTAL DETERMINATION OF WHISTLER WAVE DISPERSION RELATION IN THE SOLAR WIND
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DOI：
10.3847/2041-8205/829/1/l16
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
D. Stansby;T. Horbury;C. Chen;L. Matteini
中科院分区：
文献类型：
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作者：
D. Stansby;T. Horbury;C. Chen;L. Matteini
太阳风中大振幅哨声波包的起源和性质尚不清楚。在这封信中，我们利用来自ARTEMIS任务的单个航天器电场和磁场波形测量来计算多个间隔内单个波包的等离子体帧频率和波矢量。这允许直接比较实验测量与理论色散关系，以确定观察到的波为哨声波。哨声是右圆极化的，反太阳方向传播，并与背景磁场对齐。它们的色散受到局域电子平行β的强烈影响，符合线性理论。测量的性质与太阳风中产生这些波的电子热流不稳定性是一致的。
The origins and properties of large-amplitude whistler wavepackets in the solar wind are still unclear. In this Letter, we utilize single spacecraft electric and magnetic field waveform measurements from the ARTEMIS mission to calculate the plasma frame frequency and wavevector of individual wavepackets over multiple intervals. This allows direct comparison of experimental measurements with theoretical dispersion relations to identify the observed waves as whistler waves. The whistlers are right-hand circularly polarized, travel anti-sunward, and are aligned with the background magnetic field. Their dispersion is strongly affected by the local electron parallel beta in agreement with linear theory. The properties measured are consistent with the electron heat flux instability acting in the solar wind to generate these waves.