HR: 1340h
AN: SH13A-1095    [Abstracts]
TI: Nonlinear Force-Free Field Extrapolation of NOAA AR 0696
AU: * Thalmann, J K
EM: thalmann@mps.mpg.de
AF: Max-Planck-Institut fuer Sonnensystemforschung, Max-Planck-Strasse 2, Katlenburg- Lindau, NI 37191, Germany
AU: Wiegelmann, T
EM: wiegelmann@mps.mpg.de
AF: Max-Planck-Institut fuer Sonnensystemforschung, Max-Planck-Strasse 2, Katlenburg- Lindau, NI 37191, Germany
AB: We investigate the 3D coronal magnetic field structure of NOAA AR 0696 in the period of November 09-11, 2004, before and after an X2.5 flare (occurring around 02:13 UT on November 10, 2004). The coronal magnetic field dominates the structure of the solar corona and consequently plays a key role for the understanding of the initiation of flares. The most accurate presently available method to derive the coronal magnetic field is currently the nonlinear force-free field extrapolation from measurements of the photospheric magnetic field vector. These vector-magnetograms were processed from stokes I, Q, U, and V measurements of the Big Bear Solar Observatory and extrapolated into the corona with the nonlinear force-free optimization code developed by Wiegelmann (2004). We analyze the corresponding time series of coronal equilibria regarding topology changes of the 3D coronal magnetic field during the flare. Furthermore, quantities such as the temporal evolution of the magnetic energy and helicity are computed.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7509 Corona
DE: 7519 Flares
DE: 7524 Magnetic fields
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting