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The emergence of a twisted magnetic flux tube into a preexisting coronal arcade View all abstracts by submitter

Sarah Gibson   Submitted: 2003-11-11 09:53

To investigate the dynamic evolution of coronal magnetic field in response to the emergence of significantly twisted magnetic structures, we perform MHD simulations in the low-beta regime of the emergence of a twisted magnetic flux tube into a pre-existing coronal potential magnetic arcade. Our simulation of a twisted flux tube, which when fully emerged, contains a twist of 1.875 imes 2 pi field-line rotation about the axis between the anchored footpoints, leads to a magnetic structure with substantial writhing of the tube axis (apex rotation > 90 degrees) as a result of the non-linear evolution of the kink instability. For an emerging tube with a left-handed twist (which is the preferred sense of twist for active regions in the northern hemisphere), the writhing of the tube is also left-handed, producing a forward S-shape for the tube axis as viewed from the top, which is opposite to the inverse S-shaped X-ray sigmoid structures preferentially seen in the northern hemisphere. However we find that the writhing motion of the tube and its interaction with the ambient coronal magnetic field also drives the formation of an intense current layer which displays an inverse S-shape, consistent with the shape of X-ray sigmoids.

Authors: Y. Fan and S. Gibson
Projects:

Publication Status: ApJ, 589, L105, 2003
Last Modified: 2003-11-14 09:40
Go to main E-Print page  Helicity of magnetic clouds and their associated active regions  Rapid Penumbral Decay Following Three X-Class Flares  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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