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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Solar wind density influence on geomagnetic storm intensity
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Solar wind density influence on geomagnetic storm intensity

机译：太阳风对磁暴密度的影响强度

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摘要

Solar wind density has been argued to have a strong effect on geomagnetic storms. Elevated solar wind density tends to occur in time intervals when the solar wind electric field is large. This complicates the analysis required to identify a solar wind density influence because the solar wind electric field is the dominant driver of geomagnetic storms. Statistical studies have consistently shown that the independent correlation between solar wind density and geomagnetic storm intensity (via a proxy, such as the D_(st) index) is small. Modeling considerations predict a significant geomagnetic storm dependence on the plasma sheet density, which is indirectly connected to solar wind density. In this work, the solar wind density influence is quantified using two statistical measures: (I) data-derived impulse response functions and (2) the relationship between the integrated value of D_(st) to the integrated value of the solar wind electric field during geomagnetic storm intervals. Results from both approaches indicate that the solar wind density modifies the geoefficiency or the ability of a given value of the solar wind electric field to create a Ddisturbance. The impulse response method also predicts that solar wind density explains the difference in geoefficiency, as opposed to the solar wind dynamic pressure. Although the geoefficiency effect is large, its influence is shown to be small when only large storms are considered because large storms typically have large density.
机译：太阳风密度被认为有强烈影响地磁风暴。太阳风密度往往发生在时间当太阳风电场大。确定一个因为太阳风密度的影响太阳风电场是占主导地位的司机的地磁风暴。一直显示,独立太阳能风能密度和相关性磁暴强度(通过代理,如D_ (st)指数)很小。考虑预测重要的地磁风暴对等离子体密度板的依赖,这是间接连接到太阳风呢密度。影响是使用两个统计量化措施:(I)数据脉冲响应功能和(2)之间的关系综合价值D_ (st)的集成太阳风中电场的价值磁暴的间隔。方法表明太阳风密度修改geoefficiency或的能力给定值的太阳风电场创建一个Ddisturbance。方法还预测,太阳风密度geoefficiency的差异解释说相对于太阳风动态压力。尽管geoefficiency影响很大,它的影响小,只有大风暴被认为是由于大风暴通常有大密度。

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