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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Low-frequency electromagnetic cyclotron waves in and around magnetic clouds: STEREO observations during 2007-2013
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Low-frequency electromagnetic cyclotron waves in and around magnetic clouds: STEREO observations during 2007-2013

机译：低频电磁回旋波和周围磁云:立体观测在2007 - 2013

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摘要

Wave activities in the solar wind are an important topic and magnetic clouds (MCs) are a common phenomenon in interplanetary space, though waves activities associated with MCs have not been well documented. Based on a survey of 120 MCs observed by STEREO spacecraft during the years 2007-2013, this work studies electromagnetic cyclotron waves (ECWs) near the proton cyclotron frequency in and around MCs. For total 7807 ECW events, 24% of them occurred in the regions within MCs while 76% occurred in the regions around MCs. Statistics indicate that ECWs around MCs have higher frequencies, wider bandwidths, and stronger powers relative to the waves in MCs. More ECWs, on the other hand, tend to be related to a plasma with higher temperature, lower density, and larger velocity. In particular, it is found that there exist positive power law correlations between plasma betas and the wave frequencies, bandwidths, and powers. The results imply that the plasma beta should play an important role in determining the properties of ECWs, which is consistent with previous theory studies and the recent simulation results.
机译：波在太阳风是一个重要的活动主题和磁云(MCs)是一种常见的在星际空间现象,虽然波与MCs没有相关的活动记录。通过立体飞船在2007年- 2013年,这项工作研究电磁回旋波(ecw)质子回旋频率附近在MCs。他们在MCs, 76%发生在该地区发生在MCs周围的地区。表明ecw在MCs更高频率、更宽的带宽和更强大权力相对于MCs的波浪。另一方面,往往是与等离子体有关较高的温度,降低密度,更大的速度。存在积极的幂律关系等离子贝塔和波之间的频率,带宽和权力。血浆β应该发挥重要作用确定ecw的属性,这是与之前的理论研究和一致最近的仿真结果。

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