Magnetosonic wave instability analysis for proton ring distributions observed by the LANL magnetospheric plasma analyzer
Magnetosonic wave instability analysis for proton ring distributions observed by the LANL magnetospheric plasma analyzer
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DOI：
10.1029/2010ja016068
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发表时间：
2011-03
影响因子：
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通讯作者：
Lunjin Chen;R. Thorne;V. Jordanova;M. Thomsen;R. Horne
中科院分区：
文献类型：
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作者：
Lunjin Chen;R. Thorne;V. Jordanova;M. Thomsen;R. Horne
对洛斯阿拉莫斯国家实验室地球同步轨道卫星上的磁层等离子体分析仪探测器测量的高能质子（1-45 keV）分布进行分析，以研究 2001 年 4 月风暴期间质子环发展的特征。从中午到午夜前，在广阔的空间区域内形成了不同的质子环，这与夜间的单个或多个亚暴注入有关。根据观测到的质子分布，计算磁声波的对流增长率。我们发现这些质子环分布可以为激发磁声波提供自由能源，对流增长率主要在 10−5–10−6 m−1 范围内，频率范围从几倍 ΩH+ 到约 35 ΩH+，磁本地时间范围从 1000 到 2200。
Energetic proton (1–45 keV) distributions measured by the magnetospheric plasma analyzer detector on Los Alamos National Laboratory geosynchronous orbiting satellites are analyzed to study the characteristics of proton ring development during the 2001 April storm. Distinct proton rings are formed over a broad spatial region from noon to premidnight, associated with individual or multiple substorm injections on the nightside. On the basis of observed proton distributions, the convective growth rate of magnetosonic waves is calculated. We find that these proton ring distributions can provide a source of free energy for exciting magnetosonic waves, with convective growth rate mostly in the range 10−5–10−6 m−1, over a broad range of frequency from a few times ΩH+ up to ~35 ΩH+ and over a broad magnetic local time range from 1000 to 2200.