Excitation of dayside chorus waves due to magnetic field line compression in response to interplanetary shocks

Chen Zhou; Wen Li; Richard M. ThorneJacob BortnikQianli MaXin AnXiao-jia ZhangVassilis AngelopoulosBinbin NiXudong GuSong FuZhengyu Zhao

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Excitation of dayside chorus waves due to magnetic field line compression in response to interplanetary shocks

机译：由于磁激发的光面合唱的波浪行压缩响应星际的冲击

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The excitation of magnetospheric whistler-mode chorus in response to interplanetary (IP) shocks is investigated using wave data from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft. As an example, we show a typical chorus wave excitation following an IP shock event that was observed by THEMIS in the postnoon sector near the magnetopause on 3 August 2010. We then analyze characteristic changes during this event and perform a survey of similar events during the period 2008–2014 using the THEMIS and OMNI data set. Our statistical analysis demonstrates that the chorus wave excitation/intensification in response to IP shocks occurs only at high L shells (L>8) on the dayside. We analyzed the variations of magnetic curvature following the arrival of the IP shock and found that IP shocks lead to more homogeneous backgroundmagnetic field configurations in the near-equatorial dayside magnetosphere; and therefore, the threshold of nonlinear chorus wave growth is likely to be reduced, favoring chorus wave generation. Our results provide the observational evidence to support the concept that the geomagnetic field line configuration plays a key role in the excitation of dayside chorus.

机译：磁层whistler-mode的激发合唱团在星际(IP)的冲击研究使用波数据的时间吗的历史事件和宏观尺度相互作用在亚暴(裁判)宇宙飞船。例子中,我们展示了一个典型的合唱波励磁IP冲击后观察到的事件忒弥斯附近postnoon部门2010年8月3日磁层。在这事件和变化特征在执行一个类似的调查事件2008 - 2014年期间使用忒弥斯和OMNI数据集。合唱波励磁/强化IP冲击反应只发生在高L贝壳的光面(L > 8)。后磁曲率的变化到来的IP震惊和发现IP冲击导致更多的均匀backgroundmagnetic字段配置在近赤道的光面磁气圈;非线性合唱波可能会增长减少,有利于合唱波的一代。结果提供了观测证据地磁场的支持这一概念行配置中起着关键作用激发的光面的合唱。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2015年第10期|8327-8338|共12页
作者
Chen Zhou; Wen Li; Richard M. ThorneJacob BortnikQianli MaXin AnXiao-jia ZhangVassilis AngelopoulosBinbin NiXudong GuSong FuZhengyu Zhao;
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作者单位

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA;

Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, China;

Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, USA;

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正文语种英语
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interplanetary shock waves; magnetopause; wavesExcitationtime historyWave dataCONFIGURATION FIELD;

机译：行星际激波波;磁层;wavesExcitationtimehistoryWave dataCONFIGURATION领域;

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Excitation of dayside chorus waves due to magnetic field line compression in response to interplanetary shocks

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