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Abstract:

The main aim of this study is to compare the amount of twist present in emerging active regions (ARs) from photospheric and coronal data. We use linear force-free field models of the observed coronal structure of ARs to determine the global twist. The coronal twist is derived, on one hand, from the force-free parameter [α] of the model and, on the other, from the computed coronal magnetic helicity normalized by the magnetic flux squared. We compare our results, for the same set of ARs, with those of Poisson et al. (Solar Phys.290, 727, 2015), in which the twist was estimated using the so-called magnetic tongues observed in line-of-sight magnetograms during AR emergence. We corroborate the agreement between the photospheric and coronal twist-sign and the presence of magnetic tongues as an early proxy of the AR non-potentiality. We find a globally linear relationship between the coronal twist and the one previously deduced for the emerging AR flux rope at the photospheric level. The coronal-twist value is typically lower by a factor of six than the one deduced for the emerging flux rope. We interpret this result as due to the partial emergence of the flux rope that forms the region. © 2015, Springer Science+Business Media Dordrecht.

Registro:

Documento: Artículo
Título:Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations
Autor:Poisson, M.; López Fuentes, M.; Mandrini, C.H.; Démoulin, P.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CONICET-UBA, Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales (FCEN), UBA, Buenos Aires, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), Meudon Principal Cedex, 92195, France
Palabras clave:Active regions: magnetic fields; Active regions: structure; Corona: models; Helicity: magnetic
Año:2015
Volumen:290
Número:11
Página de inicio:3279
Página de fin:3294
DOI: http://dx.doi.org/10.1007/s11207-015-0804-y
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v290_n11_p3279_Poisson

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Citas:

---------- APA ----------
Poisson, M., López Fuentes, M., Mandrini, C.H. & Démoulin, P. (2015) . Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations. Solar Physics, 290(11), 3279-3294.
http://dx.doi.org/10.1007/s11207-015-0804-y
---------- CHICAGO ----------
Poisson, M., López Fuentes, M., Mandrini, C.H., Démoulin, P. "Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations" . Solar Physics 290, no. 11 (2015) : 3279-3294.
http://dx.doi.org/10.1007/s11207-015-0804-y
---------- MLA ----------
Poisson, M., López Fuentes, M., Mandrini, C.H., Démoulin, P. "Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations" . Solar Physics, vol. 290, no. 11, 2015, pp. 3279-3294.
http://dx.doi.org/10.1007/s11207-015-0804-y
---------- VANCOUVER ----------
Poisson, M., López Fuentes, M., Mandrini, C.H., Démoulin, P. Active-Region Twist Derived from Magnetic Tongues and Linear Force-Free Extrapolations. Sol. Phys. 2015;290(11):3279-3294.
http://dx.doi.org/10.1007/s11207-015-0804-y