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Ionospheric mass ejection in response to a CME

机译：响应CME的电离层质量喷射

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摘要

We report observations of a direct ionospheric plasma outflow response to the incidence of an interplanetary shock and associated coronal mass ejection (CME) upon the earth's magnetosphere. Data from the WIND spacecraft, 185 R_E upstream, document the passage of an interplanetary shock at 23:20 UT on 24 Sept. 1998. The polar cap plasma environment sampled by the POLAR spacecraft changed abruptly at 23:45 UT, reflecting the compressional displacement of the geopause relative to the spacecraft. POLAR left the polar wind outflow region and entered the mantle flows. Descending toward the dayside cusp region, POLAR later returned from the mantle to an enhanced polar wind flux dominated by O+ plasma and eventually containing molecular ions. The enhanced and O+-dominated outflow continued as the spacecraft passed through the high altitude cleft and then the southern cleft at lower altitude. Such a direct response of the ionosphere to solar wind dynamic pressure disturbances may have important impacts on magnetospheric dynamics.
机译：我们报告了对地球际磁层上行星际激波和相关冠状物质抛射（CME）发生率的直接电离层等离子体流出响应的观察结果。来自上游185 R_E的WIND航天器的数据记录了1998年9月24日23:20 UT行星际冲击的通过。由POLAR航天器采样的极帽等离子体环境在UT 23:45突变，反映了压缩位移相对于航天器的暂停时间。 POLAR离开极地风流出区域并进入地幔流。下降到白天的尖端区域，POLAR随后从地幔返回到增强的极性风通量，该通量由O +等离子体控制，最终包含分子离子。随着航天器穿过高空裂缝，然后穿过较低高度的南部裂缝，增强的和以O +为主的流出继续进行。电离层对太阳风动态压力扰动的这种直接响应可能对磁层动力学产生重要影响。

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