Extrapolation of Three-dimensional Magnetic Field Structure in Flare-productive Active Regions with Different Initial Conditions

Abstract

The nonlinear force-free field (NLFFF) modeling has been extensively used as a tool to infer three-dimensional (3D) magnetic field structure. In this study, the dependency of the NLFFF calculation with respect to the initial guess of the 3D magnetic field is investigated. While major part of the previous studies used potential field as the initial guess in the NLFFF modeling, we adopt the linear force-free fields with different constant force-free alpha as the initial guesses. This method enables us to investigate how unique the magnetic field obtained by the NLFFF extrapolation with respect to the initial guess is. The dependence of the initial condition of the NLFFF extrapolation is smaller in the strong magnetic field region. Therefore, the magnetic field at the lower height ($<10$ Mm) tends to be less affected by the initial condition (correlation coefficient C>0.9 with different initial condition), although the Lorentz force is concentrated at the lower height.

accepted in ApJ

References in corpus (6)

• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
• Non-linear force-free field modeling of a solar active region around the time of a major flare and coronal mass ejection
• Nonlinear Force-Free Field Extrapolation of a Coronal Magnetic Flux Rope Supporting a Large-Scale Filament from Photospheric Vector Magnetogram
• An optimization principle for the computation of MHD equilibria in the solar corona
• Effect of Polarimetric Noise on the Estimation of Twist and Magnetic Energy of Force-Free Fields
• Non-potential field formation in the X-shaped quadrupole magnetic field configuration

Cited by in corpus (4)

• How eruptions of a small filament feed materials to a nearby larger-scaled filament
• Chromospheric magnetic field: A comparison of He I 10830 A observations with nonlinear force-free field extrapolation
• Magnetic Field of Solar Dark Filaments Obtained from He I 10830 Angstrom Spectro-polarimetric Observation
• Polarization calibration of the Tandem Etalon Magnetograph of the Solar Magnetic Activity Research Telescope at Hida Observatory