HR: 0830h
AN: SP41B-08    [Abstracts]
TI: Transport of Poloidal Flux Along Subphotospheric Flux Ropes: Photospheric Signatures
AU: * Chen, J
EM: chen@ppd.nrl.navy.mil
AF: Plasma Physics Division, Naval Research Laboratory, Washington, DC,
AU: Huba, J D
EM: huba@ppdmail.nrl.navy.mil
AF: Plasma Physics Division, Naval Research Laboratory, Washington, DC,
AB: 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.
DE: 7513 Coronal mass ejections
DE: 7524 Magnetic fields
DE: 7544 Stellar interiors and dynamo theory
DE: 7546 Transition region
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly