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• W2164138556 endingPage "34" @default.
• W2164138556 startingPage "34" @default.
• W2164138556 abstract "We developed a coronal nonlinear force-free field (COR-NLFFF) forward-fitting code that fits an approximate nonlinear force-free field (NLFFF) solution to the observed geometry of automatically traced coronal loops. In contrast to photospheric NLFFF codes, which calculate a magnetic field solution from the constraints of the transverse photospheric field, this new code uses coronal constraints instead, and this way provides important information on systematic errors of each magnetic field calculation method, as well as on the non-force-freeness in the lower chromosphere. In this study we applied the COR-NLFFF code to NOAA Active Region 11158, during the time interval of 2011 February 12–17, which includes an X2.2 GOES-class flare plus 35 M- and C-class flares. We calculated the free magnetic energy with a 6 minute cadence over 5 days. We find good agreement between the two types of codes for the total nonpotential EN and potential energy EP but find up to a factor of 4 discrepancy in the free energy Efree = EN − EP and up to a factor of 10 discrepancy in the decrease of the free energy ΔEfree during flares. The coronal NLFFF code exhibits a larger time variability and yields a decrease of free energy during the flare that is sufficient to satisfy the flare energy budget, while the photospheric NLFFF code shows much less time variability and an order of magnitude less free-energy decrease during flares. The discrepancy may partly be due to the preprocessing of photospheric vector data but more likely is due to the non-force-freeness in the lower chromosphere. We conclude that the coronal field cannot be correctly calculated on the basis of photospheric data alone and requires additional information on coronal loop geometries." @default.
• W2164138556 created "2016-06-24" @default.
• W2164138556 creator A5023363049 @default.
• W2164138556 creator A5075355111 @default.
• W2164138556 creator A5089744093 @default.
• W2164138556 date "2014-03-21" @default.
• W2164138556 modified "2023-10-13" @default.
• W2164138556 title "THE MAGNETIC FIELD OF ACTIVE REGION 11158 DURING THE 2011 FEBRUARY 12-17 FLARES: DIFFERENCES BETWEEN PHOTOSPHERIC EXTRAPOLATION AND CORONAL FORWARD-FITTING METHODS" @default.
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• W2164138556 doi "https://doi.org/10.1088/0004-637x/785/1/34" @default.
• W2164138556 hasPublicationYear "2014" @default.
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