太阳活动周期23的自动化LASCO CME星表：日冕物质抛射是尺度不变的吗？
Automated LASCO CME catalog for solar cycle 23: are CMEs scale invariant?
摘要：
在本文中，我们提出了第一个自动构建的LASCO CME目录，计算机辅助CME跟踪软件（CACTus）的LASCO存档期间的间隔1997年9月至2007年1月的应用程序的结果。我们研究了日冕物质抛射的特征，并将它们与人工探测（CMECME目录）获得的类似结果进行了比较。CACTus平均每天在太阳活动极小期检测不到2次事件，在太阳活动极大期检测到8次事件，其中近一半是狭窄的（< 20度）。假设一个校正因子，我们发现，CACTus的CME率是惊人的一致，在过去的30年中发现的CME率。CACTus的统计数据表明，小规模外流是普遍观察到的外日冕。大多数CACTus事件都是与先前的CME活动或缓慢太阳风的强度变化有关的狭窄瞬变，反映了其湍流性质。CACTus-{仅\it}事件的显著部分（约15%）被鉴定为独立事件，因此与其他CME活性无关。CACTus日冕物质抛射的宽度分布在20到120度的范围内基本上是尺度不变的，而以前的星表在30度左右呈现出一个广泛的最大值。日冕物质外流的大小遵循幂律分布的可能性可能表明不存在典型的CME大小，即狭窄的瞬变与较大的明确定义的CME没有区别。
英文摘要：
In this paper we present the first automatically constructed LASCO CME catalog, a result of the application of the Computer Aided CME Tracking software (CACTus) on the LASCO archive during the interval September 1997 - January 2007. We have studied the CME characteristics and have compared them with similar results obtained by manual detection (CDAW CME catalog). On average CACTus detects less than 2 events per day during solar minimum up to 8 events during maximum, nearly half of them being narrow (< 20 degrees). Assuming a correction factor, we find that the CACTus CME rate is surprisingly consistent with CME rates found during the past 30 years. The CACTus statistics show that small scale outflow is ubiquitously observed in the outer corona. The majority of CACTus-only events are narrow transients related to previous CME activity or to intensity variations in the slow solar wind, reflecting its turbulent nature. A significant fraction (about 15%) of CACTus-{\it only} events were identified as independent events, thus not related to other CME activity. The CACTus CME width distribution is essentially scale invariant in angular span over a range of scales from 20 to 120 degrees while previous catalogues present a broad maximum around 30 degrees. The possibility that the size of coronal mass outflows follow a power law distribution could indicate that no typical CME size exists, i.e. that the narrow transients are not different from the larger well-defined CMEs.
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