HR: 09:30h
AN: SP51C-04    [Abstracts]
TI: A Search for the Relationship Between Subphotospheric Dynamics of Active Regions and Flaring Activity
AU: * Kosovichev, A G
EM: AKosovichev@solar.stanford.edu
AF: HEPL, Stanford University, 455 via Palou, Stanford, CA 94305-4085 United States
AU: Duvall, T L
EM: TDuvall@solar.stanford.edu
AF: Laboratory for Astronomy and Solar Physics, NASA/GSFC, NASA/GSFC Code 682, Solar Physics Branch , Greenbelt, MD 20771 United States
AB: MHD models of solar flares and CMEs suggest the magnetic energy for these events can be accumulated and released in magnetic structures sheared and twisted by plasma motions. We use time-distance helioseismology for investigating subphotospheric structures and dynamics of active regions that might be related to their flaring activity. In particular, we present a detailed study of active region NOAA 10486, which produced a series of X-class flares, during its passage on the solar disk for 8 days, Oct.25-Nov.1, 2003. The maps of subsurface flows and sound-speed perturbations are obtained from the SOHO/MDI data every 2-hours during this period, with 8-hour resolution and for the depth range of 0-12 Mm, and compared with the MDI magnetograms and X-ray data from RHESSI and GOES. The results reveal interesting dynamics at the depth of 4-6 Mm, which is compared with the restructuring, emergence and cancellation the magnetic field in this region.
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 7522 Helioseismology
DE: 7524 Magnetic fields
DE: 7544 Stellar interiors and dynamo theory
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly