Photospheric Flux Cancellation and the Build-up of Sigmoidal Flux Ropes

Details Photospheric Flux Cancellation and the Build-up of Sigmoidal Flux Ropes Photospheric Flux Cancellation and the Build-up of Sigmoidal Flux Ropes

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1806s&link_type=abstract

American Astronomical Society, SPD meeting #42, #18.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The magnetic structure of sigmoidal active regions is generally associated with the presence of a twisted flux rope held down by a potential arcade. There are competing theories of how the flux rope develops - by flux emergence, cancellation, or footpoint motions. We look at how flux cancellation in several sigmoidal regions, observed with XRT and AIA, affects the buildup of the underlying flux ropes. We use MDI and HMI magnetograms to quantify the flux cancellation, and the flux rope insertion method to construct non-linear force free field models of the regions. We present magnetic maps and the 3D flux rope structure. We correlate the locations of flares and build-up of free energy and helicity with flux cancellation events. We show how the flux ropes energy and flux budget changes with the different stages in the flux cancellation.

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