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López Fuentez, M.C.; Démoulin, P.; Mandrini, C.H.; Pevtsov, A.A.; Van Driel-Gesztelyi, L. "Magnetic twist and writhe of active regions. On the origin of deformed flux tubes" (2003) Astronomy and Astrophysics. 397(1):305-318
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Abstract:

We study the long term evolution of a set of 22 bipolar active regions (ARs) in which the main photospheric polarities are seen to rotate one around the other during several solar rotations. We first show that differential rotation is not at the origin of this large change in the tilt angle. A possible origin of this distortion is the nonlinear development of a kink-instability at the base of the convective zone; this would imply the formation of a non-planar flux tube which, while emerging across the photosphere, would show a rotation of its photospheric polarities as observed. A characteristic of the flux tubes deformed by this mechanism is that their magnetic twist and writhe should have the same sign. From the observed evolution of the tilt of the bipoles, we derive the sign of the writhe of the flux tube forming each AR; while we compute the sign of the twist from transverse field measurements. Comparing the handedness of the magnetic twist and writhe, we find that the presence of kink-unstable flux tubes is coherent with no more than 35% of the 20 cases for which the sign of the twist can be unambiguously determined. Since at most only a fraction of the tilt evolution can be explained by this process, we discuss the role that other mechanisms may play in the inferred deformation. We find that 36% of the 22 cases may result from the action of the Coriolis force as the flux tube travels through the convection zone. Furthermore, because several bipoles overpass in their rotation the mean toroidal (East-West) direction or rotate away from it, we propose that a possible explanation for the deformation of all these flux tubes may lie in the interaction with large-scale vortical motions of the plasma in the convection zone, including also photospheric or shallow sub-photospheric large scale flows.

Registro:

Documento: Artículo
Título:Magnetic twist and writhe of active regions. On the origin of deformed flux tubes
Autor:López Fuentez, M.C.; Démoulin, P.; Mandrini, C.H.; Pevtsov, A.A.; Van Driel-Gesztelyi, L.
Filiación:Inst. de Astronomia y Fisica Espacio, CC. 67, suc. 28, 1428 Buenos Aires, Argentina
Observatoire de Paris, LESIA, FRE 2461 (CNRS), 92195 Meudon, France
National Solar Observatory, Sacramento Peak, Sunspot, NM 88349, United States
Centre for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
Konkoly Observatory, Budapest, Pf, 67 1525, Hungary
Palabras clave:Magnetic fields; Methods: data analysis; Sun: interior; Sun: magnetic fields; Sun: photosphere; Extraterrestrial atmospheres; Magnetic fields; Mathematical models; Space research; Sun; Bipolar active regions; Magnetic twist; Photosphere; Astrophysics
Año:2003
Volumen:397
Número:1
Página de inicio:305
Página de fin:318
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v397_n1_p305_LopezFuentez

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Citas:

---------- APA ----------
López Fuentez, M.C., Démoulin, P., Mandrini, C.H., Pevtsov, A.A. & Van Driel-Gesztelyi, L. (2003) . Magnetic twist and writhe of active regions. On the origin of deformed flux tubes. Astronomy and Astrophysics, 397(1), 305-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v397_n1_p305_LopezFuentez [ ]
---------- CHICAGO ----------
López Fuentez, M.C., Démoulin, P., Mandrini, C.H., Pevtsov, A.A., Van Driel-Gesztelyi, L. "Magnetic twist and writhe of active regions. On the origin of deformed flux tubes" . Astronomy and Astrophysics 397, no. 1 (2003) : 305-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v397_n1_p305_LopezFuentez [ ]
---------- MLA ----------
López Fuentez, M.C., Démoulin, P., Mandrini, C.H., Pevtsov, A.A., Van Driel-Gesztelyi, L. "Magnetic twist and writhe of active regions. On the origin of deformed flux tubes" . Astronomy and Astrophysics, vol. 397, no. 1, 2003, pp. 305-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v397_n1_p305_LopezFuentez [ ]
---------- VANCOUVER ----------
López Fuentez, M.C., Démoulin, P., Mandrini, C.H., Pevtsov, A.A., Van Driel-Gesztelyi, L. Magnetic twist and writhe of active regions. On the origin of deformed flux tubes. Astron. Astrophys. 2003;397(1):305-318.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v397_n1_p305_LopezFuentez [ ]