Particle and Field Signatures of Coronal Mass Ejections in the Solar Wind
Particle and Field Signatures of Coronal Mass Ejections in the Solar Wind
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DOI：
10.1029/gm099p0245
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
M. Neugebauer;R. Goldstein
中科院分区：
文献类型：
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作者：
M. Neugebauer;R. Goldstein
当CME等离子体在行星际空间中通过航天器时，它通常可以通过等离子体和磁场的特性中的一些特征信号来识别。这些签名被简要总结。当存在两个或多个签名时，它们通常彼此不同步。作为一个例子，低温信号经常在超热电子的双向流动之前遇到。在大约四分之一的快速或高能CME事件的尾部发现了安静的，近径向场的周期。有人认为，径向场可能是CME带入太空的磁回路腿的表现。一些CME事件的尾部的另一个特征是向外传播的阿尔芬波的强通量。在某些事件中，这些波可能代表了一个返回到周围的太阳风通过CME传播，但我们认为，在其他事件中的波可能是一个短暂的日冕洞在CME的脚点的签名。
When CME plasma passes over a spacecraft in interplanetary space, it can often be recognized by a number of characteristic signatures in the properties of the plasma and magnetic field. Those signatures are briefly summarized. When two or more signatures are present, they are often not synchronized with each other. As an example, the low-temperature signature is often encountered ahead of the bidirectional streaming of suprathermal electrons. Periods of quiet, nearly radial fields are found in the trailing portions of approximately one quarter of the fast or energetic CME events. It is suggested that the radial fields may be manifestations of the legs of magnetic loops carried into space by the CME. Another feature of the trailing portions of some CME events is a strong flux of outward propagating Alfven waves. In some events these waves probably represent a return to the ambient solar wind through which the CME is propagating, but we suggest that in other events the waves may be a signature of a transient coronal hole at the footpoints of the CME.