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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Global characteristics of electromagnetic ion cyclotron waves: Occurrence rate and its storm dependence
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Global characteristics of electromagnetic ion cyclotron waves: Occurrence rate and its storm dependence

机译：全球电磁特征离子回旋波:发生率及其风暴依赖

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摘要

We statistically examine the occurrence rate of electromagnetic ion cyclotron (EMIC) waves observed by Active Magnetospheric Particle Tracer Explorers/Charge Composition Explorer (AMPTE/CCE). We use the 8 Hz magnetic field data set that covers the whole CCE mission period of nearly 4.5 years from August 1984 to January 1989, which is more than three times the period studied by Anderson et al. [] (～452 days). The large data volume allows us to evaluate the storm phase dependence of the spatial occurrence pattern of EMIC waves. The major results of this study are summarized as follows. (a) The occurrence rate is below 5% on the nightside at all L. On the dayside, the rate is 7). The results indicate two independent major processes that cause EMIC wave excitation in the Earth's magnetosphere: one externally triggers H-band waves on the dayside, and the other internally excites He-band waves on the dusk-to-afternoonside. We suggest that the former is due to solar wind compression which leads to perpendicular adiabatic ion heating and in turn an increase in temperature anisotropy, and that the latter is caused by injections of new, highly energetic ion population from the plasma sheet, with its velocity distributions becoming pancake-like on the dusk-to-afternoonside. The frequent occurrence seen on the afternoonside, at a wide L range, and during the main/development phase, strongly suggests the significant role of the sunward surge of the plasmasphere and plasma plumes in the injection-associated (i.e., storm time) EMIC wave generation.
机译：我们统计检查的出现率电磁离子回旋波(位的)观察到活性磁层粒子示踪剂探险家/电荷组成的探险家(AMPTE / CCE)。集,覆盖整个CCE任务的时期从1984年8月至1月近4.5年1989,这是三倍以上研究了安德森et al。[](~ 452天)。大数据量允许我们评估风暴空间的依赖阶段发生位的模式波。研究总结如下。出现率低于5%的阴面所有的光面l .,率 7)。结果表明两个独立的专业位的波激发的过程,原因地球的磁气圈:一个外部触发淬透性带波浪的光面,和其他内部激发乐队波上dusk-to-afternoonside。是由于太阳风压缩导致垂直的绝热离子加热和增加温度各向异性,后者是由注射的新高度高能离子等离子体片的人口,以其速度分布dusk-to-afternoonside薄饼样。频繁的出现在afternoonside,L范围宽,在主/发展阶段,强烈建议的重要作用朝着太阳飙升的等离子体层和等离子体羽毛injection-associated(也就是说,风暴时间)波位的一代。

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