3D Magnetic Modeling of Active Regions Using STEREO/EUVI

Details 3D Magnetic Modeling of Active Regions Using STEREO/EUVI 3D Magnetic Modeling of Active Regions Using STEREO/EUVI

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh32a0770s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH32A-0770

Other

7509 Corona, 7524 Magnetic Fields

Scientific paper

With the recent availability of stereoscopic data from the Extreme Ultraviolet Imager (EUVI) on the Solar Terrestrial Relations Observatory (STEREO) we have an unprecedented opportunity to investigate the accuracy of 3D magnetic field models. These data will be put to best use by modeling techniques that make no assumptions about the nature of the field (that it is potential, force-free, etc.). The Gary-Alexander radial stretching method use a series of transformations to map a simple potential field to a more complicated target field, and compare the transformed field lines with observed coronal structures in the EUV. Unlike many other simulation techniques, this approach requires only that the field remain divergence-free and continuous at the photosphere. Here we apply this transformation method to STEREO/EUVI data. We obtain a 3D potential field extrapolation using an MDI magnetogram, and utilize stereoscopy to derive the 3D field line coordinates from pairs of EUV images at 171Å. By comparing the 3D coordinates of the transformed model field lines with those of the real field lines as seen by EUVI, we can place constraints on the distribution of magnetic field and current in an active region.

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