Accuracy analysis and application of extrapolation of force-free fields in solar active and quiet regions

Liu, Suo; Zhang, Hongqi; Su, Jiangtao; Song, Maoyong

doi:10.1017/s1743921313003244

Cited by 1 publication

(1 citation statement)

References 9 publications

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“…(Note that DBIE is an advancement of the original BIE method proposed by , see also Wang et al 2000Wang et al , 2001He & Wang 2006;He et al 2011. ) This method has been utilized to analyze the coronal magnetic structures for a variety of solar ARs (He & Wang 2008;He et al 2011He et al , 2012He et al , 2014Liu et al 2013;Wang et al 2013;Yang et al 2014;Wang et al 2015). Figure 2 displays the employed photospheric vector magnetograms before and after the two flare events.…”

Section: Coronal Magnetic Field and Nonpotentiality Of The Two Activementioning

confidence: 99%

Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158

Wang

Yan

et al. 2020

Advances in Space Research

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The magnetic configuration of flare-bearing active regions (ARs) is one key aspect for understanding the initiation of solar flares. In this paper, we perform a comparative analysis on the chiral characteristics and the magnetic configurations of two X-class two-ribbon flares happening in AR 10930 and AR 11158, whose photospheric magnetic fields were observed by the Hinode and SDO satellites, respectively. The corresponding coronal magnetic fields were calculated based on the nonlinear forcefree field model. It is found that both the flares were initiated in local areas with extremely strong electric current density. The chirality of the magnetic field (indicated by the sign of force-free factor α) along the main polarity inversion line (PIL) is opposite for the two ARs, that is, left-handed (α < 0) for AR 10930 and right-handed (α > 0) for AR 11158. The analysis shows that, for both flare events, prominent magnetic connectivity (indicated by both high α and strong current distributions) was formed above the main PIL before the flare and was totally broken after the flare eruption. Yet the two branches of broken magnetic connectivity, combined with the isolated electric current at the magnetic connectivity breaking site, compose the opposite magnetic configurations for the two ARs owing to their opposite chiral characteristics. That is, Z-shaped configuration for AR 10930 with negative α and left-handed chirality, and inverse Z-shaped configuration for AR 11158 with positive α and right-handed chirality. We speculate that two-ribbon flares can be generally classified to these two magnetic configurations by chirality (α sign) of ARs.

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Section: Coronal Magnetic Field and Nonpotentiality Of The Two Activementioning

confidence: 99%

Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158

Wang

Yan

et al. 2020

Advances in Space Research

View full text Add to dashboard Cite

show abstract

Accuracy analysis and application of extrapolation of force-free fields in solar active and quiet regions

Cited by 1 publication

References 9 publications

Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158

Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158

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