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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Geospace magnetic field responses to interplanetary shocks
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Geospace magnetic field responses to interplanetary shocks

机译：地球空间磁场反应星际的冲击

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摘要

We perform a statistical survey of geospace magnetic field responses, including the geosynchronous magnetic field and the sudden impulses on the ground, to interplanetary shocks (IP shocks) between 1998 and 2005. The magnitude of the geosynchronous magnetic field (dB) responses to IP shocks depends strongly on local time, which peaks near the noon meridian; however, the relative magnitude of the responses depends only weakly on local time. These results are similar to those obtained from the statical study of the responses to solar wind dynamic pressure pulses. However, negative responses (where dB, is negative) were sometimes observed in the nightside of the magnetosphere even though the IP shocks always caused increases in the solar wind dynamic pressure, a new phenomenon not widely reported in the literature. Our analysis shows that ,75% of negative responses in the midnight sector are associated with southward interplanetary magnetic field. For a moderately compressed magnetosphere, the amplitude of the geosynchronous response dB, could be determined by the average value of the background local magnetic field. As the magnitude of the upstream solar wind dynamic pressure increases, the rate of response increases correspondingly. The dB, at the geosynchronous orbit near local noon and the amplitude 'of sudden impulses (dSYM-H) on the ground are highly correlated.
机译：我们执行地球空间的统计调查磁场的响应,包括同步轨道磁场和突然冲动在地面上,星际的冲击1998年和2005年之间(IP)冲击。的同步轨道磁场(dB)对IP冲击强烈依赖当地的反应中午时间,这山峰附近的子午线;然而,相对响应的大小只有弱取决于当地时间。从静获得类似吗研究太阳风动态的响应压力脉冲。是负的(dB),有时也被观察到阴面的磁气圈虽然IP冲击总是增加引起的太阳风动态压力,一种新现象在文献中广泛报道。显示,75%的负面反应午夜部门与南相关联行星际磁场。压缩的磁气圈的振幅同步响应数据库,可以确定当地的平均价值背景磁场。太阳风动态压力增加,税率响应相应增长。当地中午和附近的地球同步轨道振幅的突然的冲动(dSYM-H)地面是高度相关的。

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