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Poisson, M.; Démoulin, P.; López Fuentes, M.; Mandrini, C.H. "Properties of Magnetic Tongues over a Solar Cycle" (2016) Solar Physics. 291(6):1625-1646
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Abstract:

The photospheric spatial distribution of the main magnetic polarities of bipolar active regions (ARs) present during their emergence deformations are known as magnetic tongues. They are attributed to the presence of twist in the toroidal magnetic-flux tubes that form the ARs. The aim of this article is to study the twist of newly emerged ARs from the evolution of magnetic tongues observed in photospheric line-of-sight magnetograms. We apply the procedure described by Poisson et al. (Solar Phys.290, 727, 2015a) to ARs observed over the full Solar Cycle 23 and the beginning of Cycle 24. Our results show that the hemispherical rule obtained using the tongues as a proxy of the twist has a weak sign dominance (53 % in the southern hemisphere and 58 % in the northern hemisphere). By defining the variation of the tongue angle, we characterize the strength of the magnetic tongues during different phases of the AR emergence. We find that there is a tendency of the tongues to be stronger during the beginning of the emergence and to become weaker as the AR reaches its maximum magnetic flux. We compare this evolution with the emergence of a toroidal flux-rope model with non-uniform twist. The variety of evolution of the tongues in the analyzed ARs can only be reproduced when using a broad range of twist profiles, in particular having a large variety of twist gradients in the direction vertical to the photosphere. Although the analytical model used is a special case, selected to minimize the complexity of the problem, the results obtained set new observational constraints to theoretical models of flux-rope emergence that form bipolar ARs. © 2016, Springer Science+Business Media Dordrecht.

Registro:

Documento: Artículo
Título:Properties of Magnetic Tongues over a Solar Cycle
Autor:Poisson, M.; Démoulin, P.; López Fuentes, M.; Mandrini, C.H.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CONICET-UBA, Buenos Aires, Argentina
LESIA, UMR 8109 (CNRS), Observatoire de Paris, Meudon Principal Cedex, 92195, France
Facultad de Ciencias Exactas y Naturales (FCEN), UBA, Buenos Aires, Argentina
Palabras clave:Active regions, magnetic fields; Corona, structures; Helicity, magnetic; Helicity, observations
Año:2016
Volumen:291
Número:6
Página de inicio:1625
Página de fin:1646
DOI: http://dx.doi.org/10.1007/s11207-016-0926-x
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v291_n6_p1625_Poisson

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Citas:

---------- APA ----------
Poisson, M., Démoulin, P., López Fuentes, M. & Mandrini, C.H. (2016) . Properties of Magnetic Tongues over a Solar Cycle. Solar Physics, 291(6), 1625-1646.
http://dx.doi.org/10.1007/s11207-016-0926-x
---------- CHICAGO ----------
Poisson, M., Démoulin, P., López Fuentes, M., Mandrini, C.H. "Properties of Magnetic Tongues over a Solar Cycle" . Solar Physics 291, no. 6 (2016) : 1625-1646.
http://dx.doi.org/10.1007/s11207-016-0926-x
---------- MLA ----------
Poisson, M., Démoulin, P., López Fuentes, M., Mandrini, C.H. "Properties of Magnetic Tongues over a Solar Cycle" . Solar Physics, vol. 291, no. 6, 2016, pp. 1625-1646.
http://dx.doi.org/10.1007/s11207-016-0926-x
---------- VANCOUVER ----------
Poisson, M., Démoulin, P., López Fuentes, M., Mandrini, C.H. Properties of Magnetic Tongues over a Solar Cycle. Sol. Phys. 2016;291(6):1625-1646.
http://dx.doi.org/10.1007/s11207-016-0926-x