HR: 0800h
AN: SH22A-0845    [Abstracts]
TI: MHD Simulations of Small Active Regions Interacting with Coronal Holes
AU: * Lionello, R
EM: lionellor@saic.com
AF: SAIC, 10260 Campus Point Dr., Sab Diego, CA 92121-1522, United States
AU: Linker, J A
EM: linkerj@saic.com
AF: SAIC, 10260 Campus Point Dr., Sab Diego, CA 92121-1522, United States
AU: Mikić, Z
EM: mikicz@saic.com
AF: SAIC, 10260 Campus Point Dr., Sab Diego, CA 92121-1522, United States
AU: Riley, P
EM: rileype@saic.com
AF: SAIC, 10260 Campus Point Dr., Sab Diego, CA 92121-1522, United States
AB: We use our 3D MHD algorithm in spherical coordinates to study the interaction of the magnetic field of two small bipoles with that of a coronal hole. To prescribe the magnetic flux distribution at the lower boundary, we add two bipolar active regions to a smoothed Kitt Peak magnetogram for Carrington Rotation 1913 (late August 1996). Starting from a potential field extrapolation and a 1D solar wind solution, we relax the configuration until coronal holes, streamers, and the heliospheric current sheet are formed. At this point we introduce surface flows, which evolve the magnetic flux distribution at the boundary. We study the reconnection events and the changes in the distribution of closed and open magnetic flux associated with the bipolar active regions.
DE: 7509 Corona
DE: 7511 Coronal holes
DE: 7524 Magnetic fields
DE: 7526 Magnetic reconnection (2723, 7835)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting