STATISTICAL STUDY OF CORONAL MASS EJECTIONS WITH AND WITHOUT DISTINCT LOW CORONAL SIGNATURES
STATISTICAL STUDY OF CORONAL MASS EJECTIONS WITH AND WITHOUT DISTINCT LOW CORONAL SIGNATURES
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DOI：
10.1088/0004-637x/722/1/289
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
S. Ma;G. Attrill;L. Golub;J. Lin
中科院分区：
文献类型：
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作者：
S. Ma;G. Attrill;L. Golub;J. Lin
利用STEREO航天器的两个视点，我们对2009年1月1日至8月31日期间有或没有明显的低日冕特征（LCS）的日冕物质抛射（CME）进行了统计研究。在此期间，STEREO A和B的视线几乎垂直，两者都观测到了近四分之一的太阳。我们确定了源自该区域周围的 34 个日冕物质抛射，并发现 (1) 在太阳活动极小期的 8 个月期间研究的约 3 个日冕物质抛射中有 1 个是隐形日冕物质抛射；如果在盘上找不到明显的 LCS（例如日冕变暗、日冕波、灯丝喷发、耀斑、喷发后拱廊），则日冕物质抛射是隐形的。 (2) 没有濒海战斗舰的隐形 CME 的速度通常低于 300 km s−1。与濒海战斗舰的慢速日冕物质抛射相比，隐形日冕物质抛射在速度和加速度演化方面没有表现出任何明显差异。 (3)隐形日冕物质抛射的源区通常位于安静的太阳而不是活跃的区域。详细研究表明，本文中超过一半的隐形日冕物质抛射在日冕物质抛射演化之前或期间在太阳边缘上空观测到时，显示出日冕结构（可能是磁力绳的一部分）的一些微弱变化。最后，我们注意到，基于完全独立于日冕仪数据的濒海战斗舰的空间天气探测系统可能无法探测到很大一部分日冕物质抛射。
Taking advantage of the two viewpoints of the STEREO spacecraft, we present a statistical study of coronal mass ejections (CMEs) with and without distinct low coronal signatures (LCSs) from 2009 January 1 to August 31. During this period, the lines of sight from STEREO A and B are almost perpendicular and nearly a quarter of the Sun was observed by both. We identified 34 CMEs that originated from around this area and find that (1) about 1 out of 3 CMEs that were studied during 8 months of solar minimum activity are stealth CMEs; a CME is stealth if no distinct LCS (such as coronal dimming, coronal wave, filament eruption, flare, post-eruptive arcade) can be found on the disk. (2) The speeds of the stealth CMEs without LCSs are typically below 300 km s−1. Comparing with the slow CMEs with LCSs, the stealth CMEs did not show any clear differences in their velocity and acceleration evolution. (3) The source regions of the stealth CMEs are usually located in the quiet Sun rather than active regions. Detailed study indicates that more than half of the stealth CMEs in this paper showed some faint change of the coronal structures (likely parts of flux ropes) when they could be observed over the solar limb before or during the CME evolution. Finally, we note that space weather detection systems based on LCSs totally independent of coronagraph data may fail to detect a significant proportion of CMEs.