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Observational Evidence of the Excitation of Magnetosonic Waves by an He++ Ion Ring Distribution
Journal of Geophysical Research: Space Physics ( IF 2.8 ) Pub Date : 2021-07-22 , DOI: 10.1029/2021ja029532
S. G. Claudepierre 1, 2 , X. Liu 3 , L. Chen 3 , K. Takahashi 4
Affiliation  

We report plasma wave observations of equatorial magnetosonic waves at integer harmonics of the local gyrofrequency of doubly ionized helium (urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0001). The waves were observed by Van Allen Probe A on 08 Feb 2014 when the spacecraft was in the afternoon magnetic local time sector near urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0002 inside of the plasmasphere. Analysis of the complementary in-situ energetic ion measurements (1–300 keV) reveals the presence of a helium ion ring distribution centered near 30 keV. Theoretical linear growth rate calculations suggest that the local plasma and field conditions can support the excitation of the magnetosonic waves from the unstable ring distribution. This represents the first report of the generation of magnetosonic equatorial noise via a ring distribution in energetic urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0003 ions in the near-Earth space plasma environment.

中文翻译:

He++ 离子环分布激发磁声波的观测证据

我们报告了在双电离氦 ( urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0001)的局部回旋频率的整数谐波处对赤道磁声波的等离子体波观测。2014 年 2 月 8 日,当航天器urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0002处于等离子体层内部附近的下午磁当地时间扇区时,范艾伦探测器 A 观测到了这些波。对互补原位高能离子测量 (1–300 keV) 的分析揭示了以 30 keV 为中心的氦离子环分布的存在。理论线性增长率计算表明,局部等离子体和场条件可以支持来自不稳定环分布的磁声波的激发。这是通过能量环分布产生磁声赤道噪声的第一份报告。urn:x-wiley:21699380:media:jgra56629:jgra56629-math-0003 近地空间等离子体环境中的离子。
更新日期:2021-08-20
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