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Applying the weighted horizontal magnetic gradient method to a simulated flaring active region

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dc.contributor.author Korsos, M. B
dc.contributor.author Chatterjee, Piyali
dc.contributor.author Erdelyi, R
dc.date.accessioned 2020-11-12T15:18:09Z
dc.date.available 2020-11-12T15:18:09Z
dc.date.issued 2018-04-20
dc.identifier.citation The Astrophysical Journal, Vol.857, No. 2, 103, pp. 1-12 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6976
dc.description Restricted Access © The American Astronomical Society https://doi.org/10.3847/1538-4357/aab891 en_US
dc.description.abstract Here, we test the weighted horizontal magnetic gradient (WGM) as a flare precursor, introduced by Korsós et al., by applying it to a magnetohydrodynamic (MHD) simulation of solar-like flares. The preflare evolution of the WGM and the behavior of the distance parameter between the area-weighted barycenters of opposite-polarity sunspots at various heights is investigated in the simulated δ-type sunspot. Four flares emanated from this sunspot. We found the optimum heights above the photosphere where the flare precursors of the WGM method are identifiable prior to each flare. These optimum heights agree reasonably well with the heights of the occurrence of flares identified from the analysis of their thermal and ohmic heating signatures in the simulation. We also estimated the expected time of the flare onsets from the duration of the approaching–receding motion of the barycenters of opposite polarities before each single flare. The estimated onset time and the actual time of occurrence of each flare are in good agreement at the corresponding optimum heights. This numerical experiment further supports the use of flare precursors based on the WGM method. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Sun: evolution en_US
dc.subject Sun: flares en_US
dc.subject sunspots en_US
dc.title Applying the weighted horizontal magnetic gradient method to a simulated flaring active region en_US
dc.type Article en_US


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