Abstract—

This paper presents an analysis of wave activity recorded by the MMS satellites during a prolonged dipolarization in the near magnetotail (X_GSM ~ –17 R_E). It was found that multiple narrow-band, quasi-parallel whistler wave bursts were observed behind the leading front of dipolarization, during the phase of growth of the magnetic field’s B_Z component. The durations of wave bursts were ~1–15 s, and the characteristic frequencies ranged from ~0.1 to 0.8 f_c (f_c is the electron gyrofrequency). Based on a detailed analysis of a single wave burst, it was found that the frequency corresponding to the maximum value of a linear increment of quasi-parallel whistler waves was close in magnitude to the observed frequency, which indicates the possibility of satellite location close to the source of waves. We also demonstrated that, in the case under discussion, the electrons with pitch angles of 125°–135° and energies of ~3–12 keV made a largest contribution to the increment of whistler waves. These observations have shown that, during dipolarizations, the thermal and suprathermal electron populations are most effectively involved in resonant interaction with whistler waves.

中文翻译：

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近地磁尾流制动区的窄带准平行惠斯勒波的MMS观测

摘要-

本文呈现由记录的波活性的分析MMS在不久的磁尾（延长的偶极期间卫星X _GSM〜-17 - [R _ë）。研究发现，在磁场的B _Z分量的生长阶段，在双极化的前导前沿之后观察到多个窄带，准平行的惠斯勒爆裂。波浪爆发的持续时间为〜1-15 s，特征频率范围为〜0.1至0.8 f _c（f _c是电子陀螺频率）。通过对单波猝发的详细分析，发现与准平行啸叫波线性增量的最大值相对应的频率在大小上与观测到的频率接近，这表明卫星定位的可能性接近波的来源。我们还证明，在所讨论的情况下，俯仰角为125°–135°且能量为〜3–12 keV的电子对惠斯勒波的增加做出了最大贡献。这些观察结果表明，在双极化期间，热和超热电子种群最有效地参与了与惠斯勒波的共振相互作用。