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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The 17–22 October (1999) solar-interplanetary-geomagnetic event: Very intense geomagnetic storm associated with a pressure balance between interplanetary coronal mass ejection and a high-speed stream
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The 17–22 October (1999) solar-interplanetary-geomagnetic event: Very intense geomagnetic storm associated with a pressure balance between interplanetary coronal mass ejection and a high-speed stream

机译：（1999年10月17日至22日）太阳-行星际地磁事件：强烈的地磁风暴，与行星际日冕物质抛射和高速流之间的压力平衡有关

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摘要

Using observations from the Advanced Composition Explorer (ACE) magnetic field and plasma experiments, we investigate the magnetic, thermal, and dynamic pressure balance in the border of a high-speed stream (HSS) and an average-speed interplanetary coronal mass ejection (ICME) observed on 21–22 October (1999). We believe that the HSS compressed the ICME and intensified its internal southward magnetic field, resulting in a very intense geomagnetic storm, with peak Dst of -237 nT. In solar cycle 23 this was the only event, out of 18 very intense geomagnetic storms, i.e., peak Dst < -200 nT, which was caused by such a mechanism. We also address the solar origin of this very intense geomagnetic storm, using combined solar data from three different sources: a ground-based source, coronal hole maps from the National Solar Observatory (NSO) at Kitt Peak, and two satellite-based sources, eruption activity from the Extreme Ultraviolet Imaging Telescope (EIT) and coronal mass ejection observations from the Large Angle and Spectrometric Coronagraph (LASCO), both aboard the Solar and Heliospheric Observatory (SOHO). A coronal hole is evident just beside (to the east of) the active region from which an average-speed coronal mass ejection lifted off on 17–18 October (1999). This was the only possible solar origin of the 21–22 October interplanetary geomagnetic event.
机译：使用来自高级成分浏览器（ACE）磁场和等离子体实验的观察结果，我们研究了高速流（HSS）和平均速度行星际日冕质量抛射（ICME）边界中的磁，热和动态压力平衡）在10月21日至22日（1999年）观察到。我们认为，HSS压缩了ICME并增强了其内部向南的磁场，导致了非常强烈的地磁风暴，峰值Dst为-237 nT。在太阳周期23中，这是由这种机制引起的18次非常强烈的地磁风暴（即峰值Dst <-200 nT）中的唯一事件。我们还使用来自三个不同来源的组合太阳数据来解决这场非常强烈的地磁风暴的太阳起源：地面来源，基特峰国家太阳观测站（NSO）的日冕孔图和两个卫星来源，太阳和日球天文台（SOHO）上的极端紫外线成像望远镜（EIT）的喷发活动和大角度和光谱日冕仪（LASCO）的日冕物质抛射观测。在活动区域​​的旁边（东部）有明显的日冕孔，平均速度的日冕物质抛射于10月17日至18日从活动区域升起（1999年）。这是10月21-22日行星际地磁事件的唯一可能的太阳起源。

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