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Title: Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism

Abstract

In order to understand the flare trigger mechanism, we conduct three-dimensional magnetohydrodynamic simulations using a coronal magnetic field model derived from data observed by the Hinode satellite. Several types of magnetic bipoles are imposed into the photospheric boundary of the Nonlinear Force-free Field model of Active Region (AR) NOAA 10930 on 2006 December 13, to investigate what kind of magnetic disturbance may trigger the flare. As a result, we confirm that certain small bipole fields, which emerge into the highly sheared global magnetic field of an AR, can effectively trigger a flare. These bipole fields can be classified into two groups based on their orientation relative to the polarity inversion line: the so-called opposite polarity, and reversed shear structures, as suggested by Kusano et al. We also investigate the structure of the footpoints of reconnected field lines. By comparing the distribution of reconstructed field lines and observed flare ribbons, the trigger structure of the flare can be inferred. Our simulation suggests that the data-constrained simulation, taking into account both the large-scale magnetic structure and small-scale magnetic disturbance (such as emerging fluxes), is a good way to discover a flare-producing AR, which can be applied to space weather prediction.

Authors:
; ; ;  [1]
  1. Institute for Space-Earth Environmental Research, Nagoya University, Furocho, Chikusa-ku, Nagoya, Aichi, 464-8601 (Japan)
Publication Date:
OSTI Identifier:
22663491
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 842; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; DISTRIBUTION; DISTURBANCES; FORECASTING; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PHOTOSPHERE; REVERSED SHEAR; SATELLITES; SIMULATION; SOLAR FLARES; SPACE; STELLAR CORONAE; SUN; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Muhamad, J., Kusano, K., Inoue, S., and Shiota, D. Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA750E.
Muhamad, J., Kusano, K., Inoue, S., & Shiota, D. Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism. United States. doi:10.3847/1538-4357/AA750E.
Muhamad, J., Kusano, K., Inoue, S., and Shiota, D. Tue . "Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism". United States. doi:10.3847/1538-4357/AA750E.
@article{osti_22663491,
title = {Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism},
author = {Muhamad, J. and Kusano, K. and Inoue, S. and Shiota, D.},
abstractNote = {In order to understand the flare trigger mechanism, we conduct three-dimensional magnetohydrodynamic simulations using a coronal magnetic field model derived from data observed by the Hinode satellite. Several types of magnetic bipoles are imposed into the photospheric boundary of the Nonlinear Force-free Field model of Active Region (AR) NOAA 10930 on 2006 December 13, to investigate what kind of magnetic disturbance may trigger the flare. As a result, we confirm that certain small bipole fields, which emerge into the highly sheared global magnetic field of an AR, can effectively trigger a flare. These bipole fields can be classified into two groups based on their orientation relative to the polarity inversion line: the so-called opposite polarity, and reversed shear structures, as suggested by Kusano et al. We also investigate the structure of the footpoints of reconnected field lines. By comparing the distribution of reconstructed field lines and observed flare ribbons, the trigger structure of the flare can be inferred. Our simulation suggests that the data-constrained simulation, taking into account both the large-scale magnetic structure and small-scale magnetic disturbance (such as emerging fluxes), is a good way to discover a flare-producing AR, which can be applied to space weather prediction.},
doi = {10.3847/1538-4357/AA750E},
journal = {Astrophysical Journal},
number = 2,
volume = 842,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}