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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Spatial dependence of electromagnetic ion cyclotron waves triggered by solar wind dynamic pressure enhancements
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Spatial dependence of electromagnetic ion cyclotron waves triggered by solar wind dynamic pressure enhancements

机译：电离子的空间相关性回旋波由太阳风动态压力的增强

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In this paper, using the multisatellite (the Van Allen Probes and two GOES satellites) observations in the inner magnetosphere, we examine two electromagnetic ion cyclotron (EMIC) wave events that are triggered by P_(dyn) enhancements under prolonged northward interplanetary magnetic field quiet time preconditions. For both events, the impact of enhanced P_(dyn) causes EMIC waves at multiple points. However, we find a strong spatial dependence that EMIC waves due to enhanced P_(dyn) impact can occur at multiple points (likely globally but not necessarily everywhere) but with different wave properties. For Event 1, three satellites situated at a nearly same dawnside zone but at slightly different L shells see occurrence of EMIC waves but in different frequencies relative to local ion gyrofrequencies and with different polarizations. These waves are found inside or at the outer edge of the plasmasphere. Another satellite near noon observes no dramatic EMIC wave despite the strongest magnetic compression there. For Event 2, the four satellites are situated at widely separated magnetic local time zones when they see occurrence of EMIC waves. They are again found at different frequencies relative to local ion gyrofrequencies with different polarizations and all outside the plasmasphere. We propose two possible explanations that (i) if triggered by enhanced P_(dyn) impact, details of ion cyclotron instability growth can be sensitive to local plasma conditions related to background proton distributions, and (ii) there can be preexisting waves with a specific spatial distribution, which determines occurrence and specific properties of EMIC waves depending on satellite's relative position after an enhanced P_(dyn) arrives.
机译：在本文中,使用多卫星(范艾伦探针和两个卫星)观察内部磁气圈,我们检查两个电磁离子回旋加速器(位)波事件引发的P_(动力学)增强在长期向北行星际磁场安静的时间先决条件。增强P_(动力学)位的电波在多个原因点。由于增强依赖这一位的波浪P_(动力学)的影响可以出现在多个点(全球可能但不一定无处不在)但波性能也不同。三个卫星位于几乎相同dawnside区,但略有不同的贝壳看到发生波位的,但在不同频率相对于当地的离子回旋频率和不同偏振态。发现内部或外部的边缘等离子体层。观察没有戏剧性的位的波,尽管最强的磁压缩。2,四个卫星位于广泛磁分离本地时区当他们看到发生位的波。不同的频率相对于当地的离子旋转频率和不同偏振态所有在等离子体层。可能的解释,(我)如果引发的增强P_(动力学)的影响,离子回旋的细节不稳定的增长可以敏感的地方等离子体条件下质子相关背景分布,和(2)可以有先前存在波与一个特定的空间分布,确定的存在和特定属性位的波根据卫星的相对后一个增强P_(动力学)的到来。

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