Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2113w&link_type=abstract
American Astronomical Society, SPD meeting #40, #21.13; Bulletin of the American Astronomical Society, Vol. 41, p.857
Astronomy and Astrophysics
Astronomy
Scientific paper
. The issue of the influence of coronal holes (CHs) on coronal mass ejections (CMEs) in causing solar energetic particle (SEP) events is revisited. It is a continuation of our previous work (Shen et al. 2006), in which no evident effect of CHs on CMEs in generating SEPs could be found by statistically investigating 56 CME events. This result is consistent with the conclusion obtained by Kahler in 2004. However, it is contrary to the common picture that fast streams from CHs should be an adverse factor for SEP generation. In order to check again which side is right and give a more reliable result, we extrapolate the coronal magnetic field, define CHs as the regions consist of only open magnetic field lines, and perform the similar analysis on this issue. Three key parameters, CH proximity, CH area and CH relative position, are involved in the analysis. It is found that each side is correct to a certain extent. CHs have no evident effect on CMEs in causing minor SEP events, but not for major ones. The effect becomes more significant as the proton energy and (or) flux increase(s).
Shen Caiming
Wang Shuang
Wang Yuming
Yao Jun
Ye Peng
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