Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares

We analyze Hα, UV, and X-ray emissions in and around the spectacular arch system seen in the corona on 1980 March 27 during the Solar Maximum Mission. The flaring of the arch plasma is studied, and its dependence on triggering mechanisms related to the observed small limb flare in the arch foot-poin...

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Autores principales: Fontenla, J., Rovira, M., Tandberg-Hanssen, E.
Formato: JOUR
Materias:
Sun: Activity
Sun: Flares
Sun: UV radiation
Sun: X-rays, gamma rays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p925_Fontenla
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004637X_v491_n2PARTI_p925_Fontenla
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spelling todo:paper_0004637X_v491_n2PARTI_p925_Fontenla2023-10-03T14:01:44Z Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares Fontenla, J. Rovira, M. Tandberg-Hanssen, E. Sun: Activity Sun: Flares Sun: UV radiation Sun: X-rays, gamma rays We analyze Hα, UV, and X-ray emissions in and around the spectacular arch system seen in the corona on 1980 March 27 during the Solar Maximum Mission. The flaring of the arch plasma is studied, and its dependence on triggering mechanisms related to the observed small limb flare in the arch foot-point is analyzed. To drive these events, we propose a mechanism in which small electric current circuits and the localized magnetic free energy are continuously generated at a magnetic null by a pressure gradient, which then compress or expand the plasma. This free energy dissipates by Joule effect and upward transport. © 1997. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p925_Fontenla
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Sun: Activity
Sun: Flares
Sun: UV radiation
Sun: X-rays, gamma rays
spellingShingle Sun: Activity
Sun: Flares
Sun: UV radiation
Sun: X-rays, gamma rays
Fontenla, J.
Rovira, M.
Tandberg-Hanssen, E.
Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
topic_facet Sun: Activity
Sun: Flares
Sun: UV radiation
Sun: X-rays, gamma rays
description We analyze Hα, UV, and X-ray emissions in and around the spectacular arch system seen in the corona on 1980 March 27 during the Solar Maximum Mission. The flaring of the arch plasma is studied, and its dependence on triggering mechanisms related to the observed small limb flare in the arch foot-point is analyzed. To drive these events, we propose a mechanism in which small electric current circuits and the localized magnetic free energy are continuously generated at a magnetic null by a pressure gradient, which then compress or expand the plasma. This free energy dissipates by Joule effect and upward transport. © 1997. The American Astronomical Society. All rights reserved.
format JOUR
author Fontenla, J.
Rovira, M.
Tandberg-Hanssen, E.
author_facet Fontenla, J.
Rovira, M.
Tandberg-Hanssen, E.
author_sort Fontenla, J.
title Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
title_short Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
title_full Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
title_fullStr Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
title_full_unstemmed Ultraviolet events observed in active regions. II. An interpretation of flaring arches and associated small flares
title_sort ultraviolet events observed in active regions. ii. an interpretation of flaring arches and associated small flares
url http://hdl.handle.net/20.500.12110/paper_0004637X_v491_n2PARTI_p925_Fontenla
work_keys_str_mv AT fontenlaj ultravioleteventsobservedinactiveregionsiianinterpretationofflaringarchesandassociatedsmallflares
AT roviram ultravioleteventsobservedinactiveregionsiianinterpretationofflaringarchesandassociatedsmallflares
AT tandberghanssene ultravioleteventsobservedinactiveregionsiianinterpretationofflaringarchesandassociatedsmallflares
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