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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >October/November 2003 interplanetary coronal mass ejections: ACE/EPAM solar energetic particle observations
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October/November 2003 interplanetary coronal mass ejections: ACE/EPAM solar energetic particle observations

机译：2003年10月/ 11月行星际日冕物质抛射：ACE / EPAM太阳高能粒子观测

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摘要

In late October and early November 2003 the ACE spacecraft at 1 AU detected two shock-associated interplanetary coronal mass ejections (ICMEs). In the sheath region formed in front of both ICMEs, some of the highest speeds ever directly measured in the solar wind were observed. We analyze in detail the energetic particle signatures measured at 1 AU by the EPAM experiment on board ACE during the passage and in the vicinity of these ICMEs. Solar energetic particles (SEPs) are utilized as diagnostic tracers of the large-scale structure and topology of the interplanetary magnetic field (IMF) embedded within both ICME events. In order to explain the bidirectional particle flows observed within both ICMEs, we have examined two candidate scenarios for these ICMEs in terms of open and closed magnetic field configurations. In the context of an open field configuration, the enhanced magnetic field regions associated with the CME-driven shocks mirror the energetic particles and hence the observed bidirectional flows. In the context of a closed field configuration, bidirectional flows result from particle circulation and reflection in a looped field configuration. Furthermore, we use the ACE/EPAM observations to reassess the leading and trailing boundaries of the ICMEs with respect to those previously proposed based upon ACE/SWEPAM solar wind plasma, suprathermal electron measurements, and ACE/MAG magnetic field data.
机译：在2003年10月下旬和11月初，ACE飞船在1 AU发现了两次与冲击有关的行星际日冕物质抛射（ICME）。在两个ICME前面形成的鞘区中，观察到一些有史以来在太阳风中直接测得的最高速度。我们详细分析了通过ACE期间和这些ICME附近的EPAM实验在1 AU处测得的高能粒子特征。太阳高能粒子（SEP）用作诊断示踪剂，用于跟踪两个ICME事件中所嵌入的行星际磁场（IMF）的大规模结构和拓扑。为了解释在两个ICME中观察到的双向粒子流，我们从开放和封闭磁场配置方面检查了这些ICME的两种候选方案。在开放磁场配置的情况下，与CME驱动的冲击相关的增强磁场区域会反射高能粒子，因此会观察到双向流动。在封闭场配置的情况下，双向流由环形场配置中的粒子循环和反射产生。此外，相对于先前基于ACE / SWEPAM太阳风等离子体，超热电子测量和ACE / MAG磁场数据提出的那些建议，我们使用ACE / EPAM的观察结果重新评估了ICME的前缘和后缘。

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