Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh44a..06k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH44A-06
Astronomy and Astrophysics
Astrophysics
[7511] Solar Physics, Astrophysics, And Astronomy / Coronal Holes, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles
Scientific paper
The onset times and peak intensities of solar energetic particle (SEP) events at Earth have long been thought to be influenced by the open magnetic fields of coronal holes (CHs). The basic idea is that when CHs lie between the solar SEP source region and the interplanetary magnetic field lines connecting the Earth to the Sun, there will be a delay in onset and/or a diminution in the peak intensity of the SEP event. Shen et al.(2006) found that neither CH proximity nor CH relative location produced any obvious effect on SEP peak intensities. However, Gopalswamy et al.(2009) have used SOHO/EIT CHs and a defined CH influence parameter to show that nearby CHs can deflect fast CMEs from their expected directions in space, explaining the appearance of driverless shocks at 1 AU from CMEs ejected near solar central meridian. Recent work has looked at the relation between CHs and CMEs over the rise, maximum, and declining phases of solar cycle 23. Here we use the CH locations and influence parameters to examine the effects of CHs on the timing and intensities of SEP events observed by the GOES and Wind spacecraft. We also include cases of fast CMEs that drive shocks but produce no or only weak SEP events at Earth. The goal is to use CH locations to help predict the SEP events produced by fast and wide CMEs.
Akiyama Sanae
Gopalswamy Nat
Kahler Stephen W.
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