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Title: Non-potential Field Formation in the X-shaped Quadrupole Magnetic Field Configuration

Abstract

Some types of solar flares are observed in X-shaped quadrupolar field configuration. To understand the magnetic energy storage in such a region, we studied non-potential field formation in an X-shaped quadrupolar field region formed in the active region NOAA 11967, which produced three X-shaped M-class flares on 2014 February 2. Nonlinear force-free field modeling was applied to a time series of vector magnetic field maps from the Solar Optical Telescope on board Hinode and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory . Our analysis of the temporal three-dimensional magnetic field evolution shows that the sufficient free energy had already been stored more than 10 hr before the occurrence of the first M-class flare and that the storage was observed in a localized region. In this localized region, quasi-separatrix layers (QSLs) started to develop gradually from 9 hr before the first M-class flare. One of the flare ribbons that appeared in the first M-class flare was co-spatial with the location of the QSLs, suggesting that the formation of the QSLs is important in the process of energy release. These QSLs do not appear in the potential field calculation, indicating that they were created by the non-potential field.more » The formation of the QSLs was associated with the transverse photospheric motion of the pre-emerged flux and the emergence of a new flux. This observation indicates that the occurrence of the flares requires the formation of QSLs in the non-potential field in which free magnetic energy is stored in advance.« less

Authors:
;  [1];  [2]
  1. Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  2. Max-Planck-Institute for Solar System Research, Justus-von-Liebig-Weg 3 D-37077 Göttingen (Germany)
Publication Date:
OSTI Identifier:
22663483
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; CONFIGURATION; EVOLUTION; FREE ENERGY; LAYERS; MAGNETIC ENERGY STORAGE; MAGNETIC FIELD CONFIGURATIONS; MAGNETIC FIELDS; NONLINEAR PROBLEMS; QUADRUPOLES; SIMULATION; SOLAR FLARES; SUN; TELESCOPES; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Kawabata, Y., Shimizu, T., and Inoue, S., E-mail: kawabata.yusuke@ac.jaxa.jp. Non-potential Field Formation in the X-shaped Quadrupole Magnetic Field Configuration. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA71A0.
Kawabata, Y., Shimizu, T., & Inoue, S., E-mail: kawabata.yusuke@ac.jaxa.jp. Non-potential Field Formation in the X-shaped Quadrupole Magnetic Field Configuration. United States. doi:10.3847/1538-4357/AA71A0.
Kawabata, Y., Shimizu, T., and Inoue, S., E-mail: kawabata.yusuke@ac.jaxa.jp. Tue . "Non-potential Field Formation in the X-shaped Quadrupole Magnetic Field Configuration". United States. doi:10.3847/1538-4357/AA71A0.
@article{osti_22663483,
title = {Non-potential Field Formation in the X-shaped Quadrupole Magnetic Field Configuration},
author = {Kawabata, Y. and Shimizu, T. and Inoue, S., E-mail: kawabata.yusuke@ac.jaxa.jp},
abstractNote = {Some types of solar flares are observed in X-shaped quadrupolar field configuration. To understand the magnetic energy storage in such a region, we studied non-potential field formation in an X-shaped quadrupolar field region formed in the active region NOAA 11967, which produced three X-shaped M-class flares on 2014 February 2. Nonlinear force-free field modeling was applied to a time series of vector magnetic field maps from the Solar Optical Telescope on board Hinode and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory . Our analysis of the temporal three-dimensional magnetic field evolution shows that the sufficient free energy had already been stored more than 10 hr before the occurrence of the first M-class flare and that the storage was observed in a localized region. In this localized region, quasi-separatrix layers (QSLs) started to develop gradually from 9 hr before the first M-class flare. One of the flare ribbons that appeared in the first M-class flare was co-spatial with the location of the QSLs, suggesting that the formation of the QSLs is important in the process of energy release. These QSLs do not appear in the potential field calculation, indicating that they were created by the non-potential field. The formation of the QSLs was associated with the transverse photospheric motion of the pre-emerged flux and the emergence of a new flux. This observation indicates that the occurrence of the flares requires the formation of QSLs in the non-potential field in which free magnetic energy is stored in advance.},
doi = {10.3847/1538-4357/AA71A0},
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}
}