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Investigation of helicity and energy flux transport in three emerging solar active regions

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dc.contributor.author Vemareddy, P
dc.date.accessioned 2020-11-17T14:44:21Z
dc.date.available 2020-11-17T14:44:21Z
dc.date.issued 2015-06-20
dc.identifier.citation The Astrophysical Journal, Vol. 806, No. 2, 245 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7194
dc.description Restricted Access © The American Astronomical Society http://dx.doi.org/10.1088/0004-637X/806/2/245 en_US
dc.description.abstract We report the results of an investigation of helicity and energy flux transport from three emerging solar active regions (ARs). Using time sequence vector magnetic field observations obtained from the Helioseismic Magnetic Imager, the velocity field of plasma flows is derived by the differential affine velocity estimator for vector magnetograms. In three cases, the magnetic fluxes evolve to pump net positive, negative, and mixed-sign helicity flux into the corona. The coronal helicity flux is dominantly coming from the shear term that is related to horizontal flux motions, whereas energy flux is dominantly contributed by the emergence term. The shear helicity flux has a phase delay of 5–14 hr with respect to absolute magnetic flux. The nonlinear curve of coronal energy versus relative helicity identifies the configuration of coronal magnetic fields, which is approximated by a fit of linear force-free fields. The nature of coronal helicity related to the particular pattern of evolving magnetic fluxes at the photosphere has implications for the generation mechanism of two kinds of observed activity in the ARs. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Sun: corona en_US
dc.subject Sun: coronal mass ejections (CMEs) en_US
dc.subject Sun: evolution en_US
dc.subject Sun: flares en_US
dc.subject Sun: magnetic fields en_US
dc.subject Sun: photosphere en_US
dc.title Investigation of helicity and energy flux transport in three emerging solar active regions en_US
dc.type Article en_US


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