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arXiv 2002.03998astro-ph.SRphysics.space-ph
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连续日冕物质抛射的空间、时间和速度关联

Space, time and velocity association of successive coronal mass ejections

Alejandro Lara. Nat Gopalswamy, Tatiana Niembro, Román Pérez-Enríquez, Seiji Yashiro

摘要:

我们的目的是研究连续的日冕物质抛射(CME)之间可能的物理联系。通过对SOHO/LASCO近20年来观测到的27761个日冕物质抛射的主要特征进行统计分析。我们发现两个连续CME之间的等待时间(WT)或经过的时间为$< 5$小时的59%和$< 25$小时的97%的事件,并且CME WT遵循Pareto IV型统计分布。相当数量的连续CME对的位置角之差小于$30^\circ$,表明它们的源位置可能在同一区域。尾随和领先的连续CME的速度之间的差异遵循广义学生t分布。WT和速度差具有重尾分布以及去趋势波动分析的事实表明CME过程具有长程相关性。由于长程相关性,我们发现连续CME的速度之间存在一个小但显著的差异,拖尾CME的速度高于领先CME的速度。这种差异在WTs 10小时时最大< 2 hrs and tends to be zero for WTs >,在太阳活动周期的上升和下降阶段更为明显。我们认为,这种差异可能是由一个拖曳力作用在CME密切相关的空间和时间。

英文摘要:

Our aim is to investigate the possible physical association between consecutive coronal mass ejections (CMEs). Through a statistical study of the main characteristics of 27761 CMEs observed by SOHO/LASCO during the past 20 years. We found the waiting time (WT) or time elapsed between two consecutive CMEs is $< 5$ hrs for 59\% and $< 25$ hrs for 97\% of the events, and the CME WTs follow a Pareto Type IV statistical distribution. The difference of the position-angle of a considerable population of consecutive CME pairs is less than $30^\circ$, indicating the possibility that their source locations are in the same region. The difference between the speed of trailing and leading consecutive CMEs follows a generalized Student t-distribution. The fact that the WT and the speed difference have heavy-tailed distributions along with a detrended fluctuation analysis shows that the CME process has a long-range dependence. As a consequence of the long-range dependence, we found a small but significative difference between the speed of consecutive CMEs, with the speed of the trailing CME being higher than the speed of the leading CME. The difference is largest for WTs < 2 hrs and tends to be zero for WTs > 10 hrs, and it is more evident during the ascending and descending phases of the solar cycle. We suggest that this difference may be caused by a drag force acting over CMEs closely related in space and time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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