Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914404b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #144.04
Physics
Scientific paper
The high spatial resolution of space-based solar telescopes like AIA and Hinode/XRT has allowed us to see fine S-shaped structures in active regions. The collection of such S-shaped loops is known as a sigmoid and are of great interest to solar physics since 68% of coronal mass ejections appear in such regions. In our research, we detail methods of studying sigmoids by using magnetograms to make non-linear force free field models and by comparing these models to the observed loops in X-ray and EUV images. We use the flux rope insertion method to set the initial parameters for these models. Furthermore, we examine the ability of contour maps of field divergence to study the field topology of sigmoids. From our models, we estimate the free energy stored in the sigmoids. From our field divergence maps, we find features of high divergence also known as quasi-separatrix layers, which can point to probable location for reconnection.
Behm Tyler
DeLuca Edward E.
Savcheva Antonia
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