Simultaneous observation of chorus and hiss near the plasmapause
Simultaneous observation of chorus and hiss near the plasmapause
复制标题
同时观察等离子层顶附近的合唱和嘶嘶声
DOI：
10.1029/2012ja017609
复制
发表时间：
2012
影响因子：
--
通讯作者：
R. Friedel
中科院分区：
文献类型：
--
作者：
B. Delport;A. Collier;J. Lichtenberger;C. Rodger;M. Parrot;M. Clilverd;R. Friedel
[1]2010年8月4日，一场中等强度的磁暴发生，最小Dst为−65 nT，最大Kp为7−。风暴开始后不久，马里恩岛（L= 2.6）就观测到了甚低频合唱。随着时间的推移，合唱的频谱结构转变为跨越相同频率范围的嘶嘶声带。重叠的合唱和嘶嘶声的观察表明，马里恩岛是接近等离子体层顶的时间，这一事件，并提供了基于地面的观测确认的产生机制的等离子体层嘶嘶声合唱波以外的等离子体层顶。在马里恩岛的合唱观测在太阳活动周期的这一时期并不常见，因此对这一事件进行了详细的调查。讨论了地磁条件，并介绍了地球同步粒子数据和来自另外两个台站的宽带数据。经验模型来预测的等离子体层顶的位置，其位置推断从膝盖哨声记录在达尼丁，新西兰。这表明马里恩岛在事件发生时位于等离子层顶附近。这一事件也与2003年万圣节风暴后在similarL观察到的合唱团进行了比较。的合唱观察的稀有性量化使用DEMETER VLF数据。的DEMETER数据，沿着与各种基于地面的VLF测量，使我们能够推断合唱源区域的时间和空间变化。
[1] On 4 August 2010 a moderate geomagnetic storm occurred with minimum Dst of −65 nT and maximum Kp of 7−. Shortly after the onset of this storm, VLF chorus was observed at Marion Island (L= 2.6). Over time the spectral structure of the chorus transformed into a hiss band spanning the same frequency range. The observation of overlapping chorus and hiss suggests that Marion Island was close to the plasmapause at the time of this event, and provides ground-based observational confirmation of the generation mechanism of plasmaspheric hiss from chorus waves outside of the plasmasphere. Chorus observations at Marion Island were not common during this period of the solar cycle and so this event was investigated in detail. The geomagnetic conditions are discussed and geosynchronous particle data and broadband data from two other stations are presented. Empirical models are employed to predict the location of the plasmapause, and its location is inferred from a knee whistler recorded at Dunedin, New Zealand. These show that Marion Island is in the vicinity of the plasmapause during the event. The event is also compared to chorus observed at similarL after the Halloween storms of 2003. The rarity of the chorus observation is quantified using DEMETER VLF data. The DEMETER data, along with the various ground based VLF measurements, allows us to infer temporal and spatial variations in the chorus source region.
影响因子：
2.8
作者：
Badman, S. V.;Achilleos, N.;Tao, C.
通讯作者：
Tao, C.