Characteristic Distribution of Current Density in Active Region 12158 Producing an X Class Solar Flare
- Submitted by: Jihye Kang, Kyung Hee University
- Authors: Jihye Kang, Tetsuya Magara and Satoshi Inoue
- Session: Tuesday morning posters.
Recently, the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamic Observatory (SDO) provides the photospheric vector magnetic field in NOAA Active Region (AR) 12158 producing an X-class flare on 10th SEP 2014. Since the solar corona is dominated by a magnetic field, force-free modeling is one of the possible ways to derive a magnetic configuration in corona. We therefore calculated a nonlinear force-free field (NLFFF) of this active region, which reproduces the inverse-S shaped sigmoidal structure shown by the observations. We also investigated topological and statistical properties of current density in this region. As a result, the current density which had been diffusely distributed in relatively broad area continuously concentrated toward the onset of the X-class flare. We also find the double power-law distribution of current density before and after the flare.