Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp43c..07s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP43C-07
Physics
7509 Corona, 7519 Flares, 7524 Magnetic Fields, 7531 Prominence Eruptions, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
We explored the non-linear force free field (NLFFF) modeling of a simple bipolar active region (NOAA 10953), which produced several small flares (mostly B class and one C8.5 class) and filament activations from April 30 to May 3 in 2007. These events appear to be associated with the frequent flux cancellations (SOHO/MDI) that occurred in the region close to the polarity inversion line. Some preliminary results of multi-wavelength observations of a C8.5 flare that occurred on May 2 will be presented. We constructed a series of NLFFF models for this active region at three times, using the flux-rope insertion method. The models are constructed based on MDI magnetograms, and constrained by Hα filaments and highly sheared loops observed by XRT aboard Hinode. We find good NLFFF models that fit the observations before the C8.5 flare, but not for the case after the flare. The flux rope contains highly sheared but weakly twisted magnetic fields. Before the C8.5 flare, this active region is close to an eruptiveon state: the axial flux in the flux rope is close to the upper limit for instability.
DeLuca Edward E.
Golub Leon
Su Yuehua
van Ballegooijen Adriaan A.
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