Speaker
Description
SUNRISE III observed an M5.3-class flare on July 13th. The 3-hour observation began at 11:44 UT, one hour before the GOES X-ray flux peaked at 12:40 UT. SCIP obtained full Stokes profiles in the 770 nm and 850 nm range, covering the photospheric Fe I 849 nm, the upper photospheric K I 766 nm and 770 nm, and the chromospheric Ca II 849 nm and 854 nm lines. The FOV of SCIP covered a part of the polarity inversion line (PIL) in the active region, where complex Stokes V profiles appeared in the photospheric lines. The Stokes inversion found that these profiles can be explained by a two-component atmosphere with both magnetic polarities. The non-linear force-free-field extrapolation suggests that the magnetic fields have a bold patch structure on the PIL. We also discuss the chromospheric magnetic field structures associated with the flare activity.