Application of Quasi-Separatrix Layer Maps to Understanding the Structure and Evolution of Sigmoids

Details Application of Quasi-Separatrix Layer Maps to Understanding the Structure and Evolution of Sigmoids Application of Quasi-Separatrix Layer Maps to Understanding the Structure and Evolution of Sigmoids

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640522s&link_type=abstract

American Astronomical Society, AAS Meeting #216, #405.22

Astronomy and Astrophysics

Astronomy

Scientific paper

We present some preliminary work in attempt to utilize Quasi-Separatrix Layer (QSL) maps for understanding the structure and evolution of sigmoids. We show sample QSL maps calculated at different heights above the photosphere and different times over the evolution of the quiescent sigmoid from February, 2007, observed with Hinode/XRT. The QSL maps use already existing static MHD models of the sigmoid, based on the flux rope insertion method. We give a short overview of the method used to set-up these maps. By comparing current distributions and the squashing factors at different height and cross sections over the sigmoid location we suggest the use of QSLs as tracers of surface and/or volumetric currents. We look at the distribution, structure, and concentration of QSLs in combination with the size and location of bald patches at different stages of the sigmoid development. We attempt to use this analysis to help us discriminate between the main scenarios for the formation and X-ray appearance of the S-like structure - flux emergence (or cancellation) and twisting foot point motions. This method may possibly shed some light on the pre-eruption configuration and eruption mechanism in sigmoids as well.

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