Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1204e&link_type=abstract
American Astronomical Society, SPD meeting #40, #12.04; Bulletin of the American Astronomical Society, Vol. 41, p.828
Astronomy and Astrophysics
Astronomy
Scientific paper
It is our goal to model the shapes of coronal loops in active regions by inserting a current along selected potential field lines and relaxing the field to a Non-Linear Force Free Model (NLFFF). We then fit these models to XRT observations of sheared loops. Because the XRT images are only 2-dimensional we lose uniqueness in our modeling in not knowing the height of certain loops. However, using triangulated loops from the two STEREO spacecraft, we can constrain the heights of the observed XRT loops and our modeled loops. STEREO observes coronal loops in 171, 195, and 284 (respectively, Fe IX, Fe XII, and Fe XV). We mainly use triangulation from the 284 wavelength because it most closely corresponds to the observed loop structures in XRT. Once a satisfactory match of loops is made we calculate and compare the theoretical physical parameters, such as temperature and density along our modeled loops, and compare those to XRT and STEREO data observations.
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