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| Paper: |
Applications of Quasi-Separatrix Layer Maps in Understanding an
XRT Sigmoid |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
261 |
| Authors: |
Savcheva, A.; van Ballegooijen, A.; DeLuca, E. E. |
| Abstract: |
We present our recent work on utilizing Quasi-Separatrix Layer (QSL)
maps for understanding the structure, evolution, and pre-eruption
behavior of the quiescent sigmoid observed with Hinode/XRT in February
2007. QSL maps are created at various heights in the corona and for 10
different observations during the evolution of the long-lasting
sigmoid. This is the first QSL analysis based on a non-linear force
free field of a sigmoid. We point out some major properties of
the QSL topology in the sigmoid and we explore how they change
spatially and temporally with the evolution of the sigmoid. We explore
how QSL topology and strength relate to current distributions and
torsion factors in the moments leading to the B-class flare. While the
current distribution in the region is smooth and extended, the QSLs
show much finer structure which may prove to be of help in pinpointing
possible reconnection or heating sites. |
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