Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...639..510s&link_type=abstract
The Astrophysical Journal, Volume 639, Issue 1, pp. 510-515.
Astronomy and Astrophysics
Astronomy
13
Acceleration Of Particles, Sun: Corona, Sun: Coronal Mass Ejections (Cmes), Sun: Particle Emission
Scientific paper
Gradual solar energetic particle (SEP) events are thought to be produced by shocks, which are usually driven by fast coronal mass ejections (CMEs). The strength and magnetic field configuration of the shock are considered the two most important factors for shock acceleration. Theoretically, both of these factors should be unfavorable for producing SEPs in or near coronal holes (CHs). Meanwhile, CMEs and CHs could impact each other. Thus, to answer the question whether CHs have real effects on the intensities of SEP events produced by CMEs, a statistical study is performed. First, a brightness gradient method is developed to determine CH boundaries. Using this method, CHs can be well identified, eliminating any personal bias. Then 56 front-side fast halo CMEs originating from the western hemisphere during 1997-2003 are investigated as well as their associated large CHs. It is found that neither CH proximity nor CH relative location manifests any evident effect on the proton peak fluxes of SEP events. The analysis reveals that almost all of the statistical results are significant at no more than one standard deviation, σ. Our results are consistent with the previous conclusion suggested by Kahler that SEP events can be produced in fast solar wind regions and there is no requirement for those associated CMEs to be significantly faster.
Shen Chenglong
Wang Shuang
Wang Yuming
Ye Pinzhong
No associations
LandOfFree
Is There Any Evident Effect of Coronal Holes on Gradual Solar Energetic Particle Events? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Is There Any Evident Effect of Coronal Holes on Gradual Solar Energetic Particle Events?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is There Any Evident Effect of Coronal Holes on Gradual Solar Energetic Particle Events? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1579904