Journal
ASTROPHYSICAL JOURNAL
Volume 662, Issue 2, Pages L127-L130Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/519378
Keywords
acceleration of particles; shock waves; Sun : coronal mass ejections (CMEs); Sun : flares; Sun : particle emission
Categories
Ask authors/readers for more resources
Large gradual solar energetic particle ( SEP) events have been found to be highly variable in their heavy ion characteristics at high energies, where these events start to show signatures typically associated with impulsive events. The signatures include enhancements in heavy ion abundances, elevated charge states of Fe at high energies, and enhanced He-3/He-4 ratios. We present results from test-particle simulations, considering the behavior of Fe and O ions in a semirealistic model for the solar corona, that diffusive shock acceleration can produce most of the observed features if the seed ions consist of suprathermals from the corona and flares. We also compare our results to a recently developed SEP model of Tylka & Lee ( 2006) and find that the critical assumptions of the model are qualitatively correct and that, despite its simplicity, it may provide a realistic description of the compositional and spectral variability of heavy ions in SEP events.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available