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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Response of Relativistic Electron Microbursts to the Arrival of High-Speed Solar Wind Streams and its Relation to Flux Variation of Trapped Radiation Belt Electrons
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Response of Relativistic Electron Microbursts to the Arrival of High-Speed Solar Wind Streams and its Relation to Flux Variation of Trapped Radiation Belt Electrons

机译：响应的相对论性电子微爆发流和高速太阳风的到来它与通量的变化关系被困电子辐射带

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摘要

Relativistic electron microbursts are frequently observed during high-speed solar wind stream (HSS) events. However, solar wind parameters, which are important for enhanced microburst precipitation, have not been well understood. We perform a superposed epoch analysis of microburst occurrence frequency during HSS events, considering the north/south component of the interplanetary magnetic field (IMF Bz) and solar wind speed. The IMF Bz dependence is investigated considering the Russell-McPherron effect following the method used by Miyoshi and Kataoka (2008, https://doi.org/10.1029/2007JA012506). We find that microbursts are most frequently observed during faster (>500 km/s) solar wind speed streams with the IMF Bz shifted southward (fast SBZ-HSS events), indicating that both fast solar wind speed and the southward IMF Bz are important for enhanced microburst precipitation. The occurrence frequency of chorus waves during the HSS events is investigated to gain an understanding of the different behavior of microburst activity in response to the HSS events. We show that relativistic electron microbursts are not always a good proxy for chorus waves, but a proxy for a subset of chorus that can resonate with MeV electrons. We also show that electron fluxes with energies from hundreds of keV to several MeV preferentially increase during the fast SBZ-HSS events. These results indicate that observation of an enhanced occurrence of relativistic electron microbursts could be used as a proxy for the direct observation of the acceleration of MeV electrons by chorus waves in the heart of the outer radiation belt, not just a proxy for chorus wave activity in general.
机译：相对论性电子微爆发频繁观察到在高速太阳风流(HSS)事件。哪些是重要的增强微爆发降水、没有很好理解。执行一个叠加微爆发的时代分析在高速钢事件发生频率,考虑的北/南分量行星际磁场(IMF Bz)和太阳能风速。考虑到Russell-McPherron效应三好和Kataoka所使用的方法(2008年,https://doi.org/10.1029/2007JA012506)。发现微爆发最频繁观察到在太阳风速度(> 500 km / s)速度与IMF Bz移向南流(快速SBZ-HSS事件),这表明两快太阳风速度和IMF向南热晕重要的增强微爆发降水。合唱的发生频率波期间高速钢事件调查获得对不同的行为的理解在应对高速钢微爆发活动事件。微爆发并不总是一个好的代理合唱,但代表合唱的一个子集能产生共鸣的兆电子伏电子。表明,电子的能量通量数百名keV几兆电子伏优先在快速增加SBZ-HSS事件。结果表明,观测的增强发生的相对论性电子微爆发可以作为一个直接的代理吗观察的加速度兆电子伏电子通过合唱电波的心外辐射带,不仅代表齐声波一般活动。

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