Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1966w&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1966
Astronomy and Astrophysics
Astrophysics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7924] Space Weather / Forecasting
Scientific paper
The coronal mass ejections (CMEs) from the same source region are called homologous CMEs. During 1997 - 1998, there are 15 CME-rich (≥ 3 CMEs) active regions (ARs) that produced at least 80 CMEs in total. By investigating these CMEs and ARs, the characteristics of homologous CMEs are studied. It is found that the distribution of the waiting time of homologous CMEs consists of two parts with a separation at about 15 hours. It implies that the CMEs with a waiting time shorter than 15 hours are probably truly physically related; we call them related-homologous CMEs. The further analysis of related-homologous CMEs reveals the following observational facts as well as the physical meanings behind them. (1) The waiting time of the related-homologous CMEs presents a Gauss-like distribution with the peak at about 8 hours. (2) There are at most one fast CME (~ 800 km/s) in any group of related-homologous CMEs, i.e., none of ARs can produce 2 or more fast CMEs within 15 hours. (3) Most related-homologous CMEs did not originate from the same polarity inversion line (PIL) as its preceding one. These findings suggest that (1) related-homologous CMEs tend to occurrence at a pace of about 8 hours, (2) the value of 8 hours does not indicate the rate of a CME-rich AR accumulating free energy for the second CME but characterizes the progress of a magnetic field structure being unstable and developing into the second CME due to the disturbance of the first one, and (3) the free energy in one AR and its accumulating rate are both limited, which usually can not support two fast CMEs in 15 hours.
Chen Chian-Chou
Liu Jinjie
Qiu Bo
Shen Caiming
Wang Shuang
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