Inferring the writhe of magnetic flux tubes from the evolution of active solar regions

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We study the long-term evolution of bipolar active regions in which the main polarities are observed to rotate one about the other along several solar rotations. We propose that this peculiar evolution is due to the emergence of distorted magnetic flux tubes. We are able to infer the sign of the wri...

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Autores principales: López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Van Driel-Gesztelyi, L.
Formato: JOUR
Materias:
Emergence of magnetic field
Flux tubes
Solar active regions
magnetic field
solar activity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00167169_v43_n1_p83_LopezFuentes
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00167169_v43_n1_p83_LopezFuentes
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spelling todo:paper_00167169_v43_n1_p83_LopezFuentes2023-10-03T14:14:40Z Inferring the writhe of magnetic flux tubes from the evolution of active solar regions López Fuentes, M.C. Mandrini, C.H. Démoulin, P. Van Driel-Gesztelyi, L. Emergence of magnetic field Flux tubes Solar active regions magnetic field solar activity We study the long-term evolution of bipolar active regions in which the main polarities are observed to rotate one about the other along several solar rotations. We propose that this peculiar evolution is due to the emergence of distorted magnetic flux tubes. We are able to infer the sign of the writhe helicity of the flux tubes from the rotation of the axis joining the main positive and negative polarities. The origin of the deformations may be explained by the development of a kink instability. Another possibility is the interaction with plasma motions during the ascent of the flux tubes in the Convective Zone. We discuss the role of the Coriolis force, convective turbulence and other large-scale motions in this process. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00167169_v43_n1_p83_LopezFuentes
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Emergence of magnetic field
Flux tubes
Solar active regions
magnetic field
solar activity
spellingShingle Emergence of magnetic field
Flux tubes
Solar active regions
magnetic field
solar activity
López Fuentes, M.C.
Mandrini, C.H.
Démoulin, P.
Van Driel-Gesztelyi, L.
Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
topic_facet Emergence of magnetic field
Flux tubes
Solar active regions
magnetic field
solar activity
description We study the long-term evolution of bipolar active regions in which the main polarities are observed to rotate one about the other along several solar rotations. We propose that this peculiar evolution is due to the emergence of distorted magnetic flux tubes. We are able to infer the sign of the writhe helicity of the flux tubes from the rotation of the axis joining the main positive and negative polarities. The origin of the deformations may be explained by the development of a kink instability. Another possibility is the interaction with plasma motions during the ascent of the flux tubes in the Convective Zone. We discuss the role of the Coriolis force, convective turbulence and other large-scale motions in this process.
format JOUR
author López Fuentes, M.C.
Mandrini, C.H.
Démoulin, P.
Van Driel-Gesztelyi, L.
author_facet López Fuentes, M.C.
Mandrini, C.H.
Démoulin, P.
Van Driel-Gesztelyi, L.
author_sort López Fuentes, M.C.
title Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
title_short Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
title_full Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
title_fullStr Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
title_full_unstemmed Inferring the writhe of magnetic flux tubes from the evolution of active solar regions
title_sort inferring the writhe of magnetic flux tubes from the evolution of active solar regions
url http://hdl.handle.net/20.500.12110/paper_00167169_v43_n1_p83_LopezFuentes
work_keys_str_mv AT lopezfuentesmc inferringthewritheofmagneticfluxtubesfromtheevolutionofactivesolarregions
AT mandrinich inferringthewritheofmagneticfluxtubesfromtheevolutionofactivesolarregions
AT demoulinp inferringthewritheofmagneticfluxtubesfromtheevolutionofactivesolarregions
AT vandrielgesztelyil inferringthewritheofmagneticfluxtubesfromtheevolutionofactivesolarregions
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