HR: 1330h
AN: SH22A-0186    [PDF]
TI: Evolution of Active Regions in the Solar Interior
AU: * Kosovichev, A G
EM: AKosovichev@solar.stanford.edu
AF: Stanford University, 455 via Palou, Stanford, CA 94305
AU: Duvall, T L
EM: TDuvall@solar.stanford.edu
AF: Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771
AB: Using data from SOHO and TRACE, we investigate the emergence, evolution and dissipation of magnetic active regions in the solar interior and atmosphere by comparing 3D maps of subsurface structures and plasma flows, obtained by acoustic tomography, with the corresponding photospheric magnetograms and coronal EUV images. We find that the growth of active regions is characterized by multiple emergence of magnetic flux structures propagating very rapidly in the upper convection zone and by the formation of large-scale converging flows. During the decay, we have observed mostly diverging flows, and have attempted to detect submergence of magnetic flux. We look at some details of the dynamics of active regions, and discuss initial results of a search for the relationship between subphotospheric shearing flows, and changes in magnetic topology and flaring activity in the corona.
UR: http://sun.stanford.edu
DE: 7522 Helioseismology
DE: 7536 Solar activity cycle (2162)
DE: 7544 Stellar interiors and dynamo theory
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting