Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh23b0363l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH23B-0363
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7524 Magnetic Fields, 7594 Instruments And Techniques
Scientific paper
Spatially resolved measurements of line-of-sight magnetic field strength and transverse magnetic field direction of the solar corona were obtained with the new SOLARC coronagraph and an optical fiber imaging spectropolarimeter. Observations of the corona above active regions NOAA 0581 and 0582 showed a reversal in the direction of the line-of-sight component of the coronal magnetic field at a height of 0.16 solar radii above the solar limb. The linear polarization map also showed signatures of the van Vleck effect. These new data allow, for the first time, direct observational tests of theoretical coronal magnetic field models. In this paper, we present a study comparing the observed coronal magnetic field structures with the theoretical model derived from potential field extrapolation. The usefulness and limitations of potential field extrapolation, as well as directions for a more sophisticated modeling effort involving MHD simulations and forward modeling of the polarization signals that take full account of atomic polarization and radiative transfer effects will be discussed.
Lin Hainan
Liu Ya-Ying
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