Transport of Poloidal Flux Along Subphotospheric Flux Ropes: Photospheric Signatures

Details Transport of Poloidal Flux Along Subphotospheric Flux Ropes: Photospheric Signatures Transport of Poloidal Flux Along Subphotospheric Flux Ropes: Photospheric Signatures

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp41b..08c&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP41B-08

Other

7513 Coronal Mass Ejections, 7524 Magnetic Fields, 7544 Stellar Interiors And Dynamo Theory, 7546 Transition Region

Scientific paper

We consider the transport of poloidal (locally azimuthal) magnetic flux along a subphotospheric flux rope, which is anchored in the convection zone. We perform 3-D MHD simulations, in which a straight cylinder is initialized using a number of different model flux ropes. We use two distinct electric current profiles, one with zero and the other with nonzero net toroidal (axial) current. The poloidal flux is increased by increasing the toroidal current at the lower footpoint, and the subsequent dynamics are studied. Simulations are carried out for uniform and nonuniform background plasmas. We discuss results with the emphasis on the expected observable signatures of the transport of poloidal flux or equivalently, magnetic helicity, across the photosphere. Work supported by ONR.

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