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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >EMIC triggered chorus emissions in Cluster data
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EMIC triggered chorus emissions in Cluster data

机译：位的触发合唱排放集群数据

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Electromagnetic ion cyclotron (EMIC) triggered chorus emissions have recently been a subject of several experimental, theoretical and simulation case studies, noting their similarities with whistler-mode chorus. We perform a survey of 8 years of Cluster data in order to increase the database of EMIC triggered emissions. The results of this is that EMIC triggered emissions have been unambiguously observed for only three different days. These three events are studied in detail. All cases have been observed at the plasmapause between 22 and 24 magnetic local time (MLT) and between - 15° and 15 ° magnetic latitude (~λ_m). Triggered emissions are also observed for the first time below the local He~+ gyrofrequency fHe+. The number of events is too low to produce statistical results, nevertheless we point out a variety of common properties of those waves. The rising tones have a high level of coherence and the waves propagate away from the equatorial region. The propagation angle and degree of polarization are related to the distance from the equator, whereas the slope and the frequency extent vary from one event to the other. From the various spacecraft separations, we determine that the triggering process is a localized phenomenon in space and time. However, we are unable to determine the occurrence rates of these waves. Small frequency extent rising tones are more common than large ones. The newly reported EMIC triggered events are generally observed during periods of large AE index values and in time periods close to solar maximum. Key Points A 8 years Cluster data survey lead to 3 new cases of EMIC triggered emissions EMIC triggered emission are observed for the first time below He+ gyrofrequency Properties are sorted in function of magnetic latitude (and magnetic indices).
机译：电磁离子回旋(位)触发合唱排放最近的主题几个实验,理论和仿真案例研究,并指出他们的相似之处whistler-mode合唱。年的集群数据为了增加位的数据库触发排放。这是位的触发排放明确观察到只有三个不同的日子。细节。当地时间22日和24日磁之间的等离子体层顶(MLT)和- 15°至15°磁纬度(~λ_m)。首次观察到以下地方他~ +旋转频率fHe +。低生产统计结果,然而我们指出各种常见的属性这些波。连贯性和电波传播的距离赤道地区。程度的极化有关赤道的距离,而斜率和从一个事件的频率范围不同其他。我们确定触发过程是一个在时间和空间上局部现象。我们不能确定发生利率这些波。音调比大的更普遍。位的报道通常引发事件观察期间的大型AE指数的值在时间接近太阳最大。点8年集群数据调查导致3位的新病例触发位的排放触发发射是第一个观察到下面他+旋转频率属性按照磁纬度(和的函数磁性指数)。

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