Solar Wind Control of Daytime, Midperiod Geomagnetic Pulsations
Solar Wind Control of Daytime, Midperiod Geomagnetic Pulsations
复制标题
太阳风对白天、中期地磁脉动的控制
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
K. Takahashi
中科院分区：
文献类型：
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作者：
E. Greenstadt;R. McPherron;K. Takahashi
许多研究已经确定，地磁脉动的各种性质与太阳风的各种性质有关。在大多数情况下，这种联系是相当松散的，这表明在脉动活动的产生和控制中必须涉及多种因素的组合。我们简要回顾了最重要的观测结果，我们描述和讨论批判性的两个最突出的模型外部生成的磁层波。我们提出的参数有利于联合应用的模型，其中在磁鞘中产生的扰动有利行星际磁场的方向被传递到磁层顶，直接转移到太阳下磁层，并放大到磁层的侧翼上的Kelvin-Helmholtz不稳定性在高太阳风的速度表面波。这种情况的组合可以解释脉动发生与行星际磁场方向、周期与行星际磁场强度以及振幅与太阳风速度的实验相关性。
Numerous studies have established that various properties of geomagnetic pulsations are linked to various properties of the solar wind. The linkage in most cases is rather loose, suggesting that combinations of factors must be involved in generation and control of pulsation activity. We review briefly the most significant observational results and we describe and discuss critically the two most prominent models for external generation of magnetospheric waves. We present arguments favoring joint application of the models, wherein perturbations in the magnetosheath resulting from favorable interplanetary field orientation are delivered to the magnetopause, transferred directly into the subsolar magnetosphere, and amplified into surface waves on the flank of the magnetosphere by Kelvin-Helmholtz instability at high solar wind speed. This combination of circumstances can account for experimental correlations of pulsation occurrence with interplanetary field orientation, periods with interplanetary field strength, and amplitudes with solar wind velocity.