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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Quasiperiodic emissions observed by the Cluster spacecraft and their association with ULF magnetic pulsations
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Quasiperiodic emissions observed by the Cluster spacecraft and their association with ULF magnetic pulsations

机译：准周期的排放观察到集群航天器及其与ULF协会磁脉冲

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摘要

Quasiperiodic (QP) emissions are electromagnetic waves at frequencies of about 0.5-4 kHz characterized by a periodic time modulation of the wave intensity, with a typical modulation period on the order of minutes. We present results of a survey of QP emissions observed by the Wide-Band Data (WBD) instruments on board the Cluster spacecraft. All WBD data measured in the appropriate frequency range during the first 10 years of operation (2001-2010) at radial distances lower than 10 R_E were visually inspected for the presence of QP emissions, resulting in 21 positively identified events. These are systematically analyzed, and their frequency ranges and modulation periods are determined. Moreover, a detailed wave analysis has been done for the events that were strong enough to be seen in low-resolution Spatio-Temporal Analysis of Field Fluctuations-Spectrum Analyzer data. Wave vectors are found to be nearly field-aligned in the equatorial region, but they become oblique at larger geomagnetic latitudes. This is consistent with a hypothesis of unducted propagation. ULF magnetic field pulsations were detected at the same time as QP emissions in 4 out of the 21 events. They were polarized in the plane perpendicular to the ambient magnetic field, and their frequencies roughly corresponded to the modulation period of the QP events.
机译：准周期的电磁(QP)排放波的频率约为0.5 4 kHz一个周期时间调制的特点波的强度,与一个典型的调制时间的分钟。观察到的调查结果QP排放宽带数据(12)仪器上集群航天器。适当的频率范围在前十多年的操作在径向(2001 - 2010)距离低于10 R_E视觉检查存在的QP排放,导致21确认事件。这些都是系统地分析,他们的频率范围和调制周期确定。一直为强大的事件做了什么在低分辨率场的时空分析Fluctuations-Spectrum分析仪数据。发现近field-aligned吗赤道地区,但他们成为斜大地磁纬度。unducted传播的一个假设。磁场脉动被检测到同时QP排放4 21事件。垂直于磁场环境,他们的频率大致对应调制的QP事件。

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