The Magnetospheric Response to 8-Minute Period Strong-Amplitude Upstream Pressure Variations
The Magnetospheric Response to 8-Minute Period Strong-Amplitude Upstream Pressure Variations
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DOI：
10.1029/ja094ia03p02505
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发表时间：
1989-03
影响因子：
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通讯作者：
D. Sibeck;Wolfgang Baumjohann;R. Elphic;D. Fairfield;J. Fennell;W. Gail;L. Lanzerotti;R. Lopez;H. Luehr;A. Lui;C. Maclennan;R. Mcentire;T. Potemra;T. Rosenberg;Kazue Takahashi
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文献类型：
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作者：
D. Sibeck;Wolfgang Baumjohann;R. Elphic;D. Fairfield;J. Fennell;W. Gail;L. Lanzerotti;R. Lopez;H. Luehr;A. Lui;C. Maclennan;R. Mcentire;T. Potemra;T. Rosenberg;Kazue Takahashi
本文记录了在径向行星际磁场 (IMF) 期间地球弓激波上游区域发生的一系列短暂、强烈 (Δp/p = 1) 的动态压力振荡。所分析的一组振荡可能是固有的太阳风或弓形激波相关现象，大约每 8-10 分钟重复一次，并且它们的磁场特征几乎同时发生在横穿地日线的很长距离上。压力振荡似乎驱动了磁层顶表面小波的尾部移动。反过来，表面小波可以被识别为外磁层中具有强压缩分量的水磁波以及电子沉淀和高纬度地面脉动的准周期变化。我们利用航天器在太阳外磁层的观测来预测地球同步磁场和太阳下磁场强度、太阳下磁层顶的位置、太阳风动态压力以及高能磁层离子通量的变化。
This paper documents a series of brief, strong (Δp/p = 1), dynamic pressure oscillations that occurred in the region upstream of the Earth's bow shock during a period of radial interplanetary magnetic field (IMF). The analyzed set of oscillations, which may be either intrinsic solar wind or bow shock-related phenomena, recur approximately every 8–10 min, and their magnetic field signatures occur nearly simultaneously over great distances transverse to the Earth-Sun line. The pressure oscillations appear to drive tailward-moving magnetopause surface wavelets. In turn, the surface wavelets can be identified as hydromagnetic waves with strong compressional components in the outer magnetosphere and as quasi-periodic variations in electron precipitation and high-latitude ground pulsations. We use observations by spacecraft in the outer dayside magnetosphere to predict geosynchronous and subsolar magnetic field strengths, the location of the subsolar magnetopause, the solar wind dynamic pressure, and variations in the energetic magnetospheric ion flux.