Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations
Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations
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DOI：
10.5194/angeo-31-1437-2013
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发表时间：
2013-08
影响因子：
1.9
通讯作者：
I. Pakhotin;S. Walker;Y. Shprits;M. Balikhin
中科院分区：
文献类型：
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作者：
I. Pakhotin;S. Walker;Y. Shprits;M. Balikhin
利用集群航天器上的多点波观测数据，推导了电磁离子回旋(EMIC)波的色散关系。在这项研究中，我们使用了一种相位差法，并在2002年3月30日一个经过充分研究的事件中从工作人员和窃窃私语中进行了观察。相位差法需要知道波矢的方向，而波矢的方向是通过最小方差分析得到的。计算了不同频率下的波矢幅值，从实验上推断了色散关系。得到的色散关系与冷等离子体色散关系基本一致。所提出的方法允许从实验上推断色散关系。它还可以用来分析在高等离子体β条件下，在局部回转频率附近的波的热等离子体色散关系。
Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and observations from STAFF and WHISPER during a well-studied event of 30 March 2002. The phase differencing method requires the knowledge of the direction of the wave vector, which was obtained using minimum variance analysis. Wave vector amplitudes were calculated for a number of frequencies to infer the dispersion relation experimentally. The obtained dispersion relation is largely consistent with the cold plasma dispersion relation. The presented method allows inferring the dispersion relation experimentally. It can be also used in the future to analyse the hot plasma dispersion relation of waves near the local gyrofrequency that can occur under high plasma beta conditions.