Skip to main content
SearchLoginLogin or Signup

Coronal Magnetic Field Extrapolation and Topological Analysis of Fine-Scale Structures during Solar Flare Precursors

Presentation #101.05 in the session Boundary Conditions and Data-driven Modeling of Solar Eruptive Events.

Published onSep 18, 2023
Coronal Magnetic Field Extrapolation and Topological Analysis of Fine-Scale Structures during Solar Flare Precursors

Magnetic field plays an important role in various solar eruption phenomena like flares, coronal mass ejections, filaments, and so on. The evolution of magnetic field topology during solar eruptions are also crucial to understand the origination of these eruptions in the solar source region. With the development of techniques and instruments, observations with higher resolutions in different wavelengths and field of views become available to provide additional information for finer structures. So it is essential to improve our method to study the magnetic field topology in the solar source regions by taking advantage of high-resolution observations. In this study, we employ a modified version of the nonlinear force-free field (NLFFF) extrapolation method based on a nonuniform grid setting for one M-class flare eruption event (June 22, 2015) with embedded vector magnetograms from Solar Dynamics Observatory (SDO) and Goode Solar Telescope (GST). The extrapolation results are obtained by maintaining the native resolutions of the corresponding GST and SDO magnetograms utilized for the bottom boundary condition. We then perform a topological analysis based on the extrapolation results and compare it with the simultaneous GST and SDO observations to investigate the associated fine structures of precursor brightenings. The analysis results indicate that by combining the high-resolution GST magnetogram with a larger HMI magnetogram, the derived magnetic field topology is consistent with a scenario of magnetic reconnection among sheared field lines across the main polarity inversion line during solar flare precursors.

Comments
0
comment
No comments here