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López Fuentes, M.C.; Mandrini, C.H.; Démoulin, P.; Choudhary D.P.; Strassmeier K.G. "Twist and writhe of δ-island active regions" (2010) Proceedings of the International Astronomical Union. 6(S273):153-156
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Abstract:

We study the magnetic helicity properties of a set of peculiar active regions (ARs) including δ-islands and other high-tilt bipolar configurations. These ARs are usually identified as the most active in terms of flare and CME production. Due to their observed structure, they have been associated with the emergence of magnetic flux tubes that develop a kink instability. Our main goal is to determine the chirality of the twist and writhe components of the AR magnetic helicity in order to set constrains on the possible mechanisms producing the flux tube deformations. We determine the magnetic twist comparing observations of the AR coronal structure with force-free models of the magnetic field. We infer the flux-tube writhe from the rotation of the main magnetic bipole during the observed evolution. From the relation between the obtained twist and writhe signs we conclude that the development of the kink instability cannot be the single mechanism producing deformed flux-tubes. © International Astronomical Union 2011.

Registro:

Documento: Artículo
Título:Twist and writhe of δ-island active regions
Autor:López Fuentes, M.C.; Mandrini, C.H.; Démoulin, P.; Choudhary D.P.; Strassmeier K.G.
Filiación:Instituto de Astronomía y Física Del Espacio (CONICET-UBA), CC 67, Suc 28, 1428 Buenos Aires, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195, Meudon Principal cedex, France
Palabras clave:Sun: activity; Sun: corona; Sun: magnetic fields; Sun: photosphere
Año:2010
Volumen:6
Número:S273
Página de inicio:153
Página de fin:156
DOI: http://dx.doi.org/10.1017/S174392131101516X
Título revista:Proceedings of the International Astronomical Union
Título revista abreviado:Proc. Int. Astron. Union
ISSN:17439213
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17439213_v6_nS273_p153_LopezFuentes

Referencias:

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Citas:

---------- APA ----------
López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Choudhary D.P. & Strassmeier K.G. (2010) . Twist and writhe of δ-island active regions. Proceedings of the International Astronomical Union, 6(S273), 153-156.
http://dx.doi.org/10.1017/S174392131101516X
---------- CHICAGO ----------
López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Choudhary D.P., Strassmeier K.G. "Twist and writhe of δ-island active regions" . Proceedings of the International Astronomical Union 6, no. S273 (2010) : 153-156.
http://dx.doi.org/10.1017/S174392131101516X
---------- MLA ----------
López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Choudhary D.P., Strassmeier K.G. "Twist and writhe of δ-island active regions" . Proceedings of the International Astronomical Union, vol. 6, no. S273, 2010, pp. 153-156.
http://dx.doi.org/10.1017/S174392131101516X
---------- VANCOUVER ----------
López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Choudhary D.P., Strassmeier K.G. Twist and writhe of δ-island active regions. Proc. Int. Astron. Union. 2010;6(S273):153-156.
http://dx.doi.org/10.1017/S174392131101516X