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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Characteristics of Sudden Commencements Observed by Van Allen Probes in the Inner Magnetosphere
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Characteristics of Sudden Commencements Observed by Van Allen Probes in the Inner Magnetosphere

机译：突然是否已经观察到的特征范艾伦辐射探测器的内部磁气圈

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摘要

We have statistically studied sudden commencement (SC) by using the data acquired from Van Allen Probes (VAP) in the inner magnetosphere (L=3.0-6.5) and GOES spacecraft at geosynchronous orbit (L =~ 6.7) from October 2012 to September 2017. During the time period, we identified 85 SCs in the inner magnetosphere and 90 SCs at geosynchronous orbit. Statistical results of the SC events reveal the following characteristics. (1) There is strong seasonal dependence of the geosynchronous SC amplitude in the radial B_V component at all local times. However, B_V shows weak seasonal variation on the dayside in the inner magnetosphere. (2) The local time dependence of the SC amplitude in the compressional B_H component at geosynchronous orbit is similar to that in the inner magnetosphere. (3) In a nightside region of L=5.0-6.5, ~19% of B_H events are negative, while ~58% of B_H events are negative at geosynchronous orbit. (4) The amplitude of the SC-associated E_y perturbations varies systematically with local time with a morning-afternoon asymmetry near noon. These observations can be explained by spatial and/or temporal changes in the magnetopause and cross-tail currents, which are caused by changes in the solar wind dynamic pressure, with respect to spacecraft positions.
机译：我们有统计上突然开始学习(SC)通过使用从范艾伦辐射获得的数据探针(VAP)内部磁气圈(L = 3.0 - -6.5),飞船在地球同步轨道(L = ~ 6.7)从2012年10月到9月2017. 内磁气圈和90年SCs SCs地球同步轨道。SC事件揭示以下特点。(1)有很强的季节性的依赖同步在径向B_V SC振幅组件在所有本地时间。弱的光面的季节性变化内部磁气圈。依赖的SC振幅在同步压缩B_H组件轨道是类似于内磁气圈。L = 5.0 - -6.5 ~ 19% B_H事件是消极的,在同步~ 58% B_H事件是负面的轨道。扰动系统与当地不同与附近的morning-afternoon不对称中午。空间和/或时间的变化磁层和cross-tail电流由于太阳风的变化动态压力,对航天器的位置。

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