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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Conjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft
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Conjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft

机译：共轭的观察准周期的排放集群,范艾伦辐射探测器,忒弥斯宇宙飞船

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摘要

We present results of a detailed analysis of two electromagnetic wave events observed in the inner magnetosphere at frequencies of a few kilohertz, which exhibit a quasiperiodic (QP) time modulation of the wave intensity. The events were observed by the Cluster and Van Allen Probes spacecraft and in one event also by the THEMIS E spacecraft. The spacecraft were significantly separated in magnetic local time, demonstrating a huge azimuthal extent of the events. Geomagnetic conditions at the times of the observations were very quiet, and the events occurred inside the plasmasphere. The modulation period observed by the Van Allen Probes and THEMIS E spacecraft (duskside) was in both events about twice larger than the modulation period observed by the Cluster spacecraft (dawnside). Moreover, individual QP elements occur about 15 s earlier on THEMIS E than on Van Allen Probes, which might be related to a finite propagation speed of a modulating ULF wave.
机译：我们目前的结果详细分析两种电磁波事件中观察到内部磁气圈几赫兹的频率,表现出一种准周期的(QP)时间调制波的强度。观察到集群和范艾伦辐射探测器航天器和在一个事件也忒弥斯的E宇宙飞船。在当地时间磁分离,证明巨大的方位的事件。次的观测条件非常安静,和内部的事件发生等离子体层。忒弥斯范艾伦辐射探测器和E飞船(duskside)是在两个事件的两倍大比调制期间观察到的集群航天器(dawnside)。个人QP元素发生大约15 s忒弥斯E比范艾伦辐射探测器,这可能与有限的传播速度调制ULF波。

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