Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events

During the rising phase of Solar Cycle 24 tremendous activity occurred on the Sun with rapid and compact emergence of magnetic flux leading to bursts of flares (C to M and even X-class). We investigate the violent events occurring in the cluster of two active regions (ARs), NOAA numbers 11121 and 11...

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Detalles Bibliográficos
Publicado: 2014
Materias:
Sun: filament eruptions
Sun: flares
Sun: magnetic fields
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v289_n6_p2041_Mandrini
http://hdl.handle.net/20.500.12110/paper_00380938_v289_n6_p2041_Mandrini
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00380938_v289_n6_p2041_Mandrini
record_format dspace
spelling paper:paper_00380938_v289_n6_p2041_Mandrini2023-06-08T15:02:50Z Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events Sun: filament eruptions Sun: flares Sun: magnetic fields During the rising phase of Solar Cycle 24 tremendous activity occurred on the Sun with rapid and compact emergence of magnetic flux leading to bursts of flares (C to M and even X-class). We investigate the violent events occurring in the cluster of two active regions (ARs), NOAA numbers 11121 and 11123, observed in November 2010 with instruments onboard the Solar Dynamics Observatory and from Earth. Within one day the total magnetic flux increased by 70 % with the emergence of new groups of bipoles in AR 11123. From all the events on 11 November, we study, in particular, the ones starting at around 07:16 UT in GOES soft X-ray data and the brightenings preceding them. A magnetic-field topological analysis indicates the presence of null points, associated separatrices, and quasi-separatrix layers (QSLs) where magnetic reconnection is prone to occur. The presence of null points is confirmed by a linear and a non-linear force-free magnetic-field model. Their locations and general characteristics are similar in both modelling approaches, which supports their robustness. However, in order to explain the full extension of the analysed event brightenings, which are not restricted to the photospheric traces of the null separatrices, we compute the locations of QSLs. Based on this more complete topological analysis, we propose a scenario to explain the origin of a low-energy event preceding a filament eruption, which is accompanied by a two-ribbon flare, and a consecutive confined flare in AR 11123. The results of our topology computation can also explain the locations of flare ribbons in two other events, one preceding and one following the ones at 07:16 UT. Finally, this study provides further examples where flare-ribbon locations can be explained when compared to QSLs and only, partially, when using separatrices. © 2013 Springer Science+Business Media Dordrecht. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v289_n6_p2041_Mandrini http://hdl.handle.net/20.500.12110/paper_00380938_v289_n6_p2041_Mandrini
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: filament eruptions
Sun: flares
Sun: magnetic fields
spellingShingle Sun: filament eruptions
Sun: flares
Sun: magnetic fields
Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
topic_facet Sun: filament eruptions
Sun: flares
Sun: magnetic fields
description During the rising phase of Solar Cycle 24 tremendous activity occurred on the Sun with rapid and compact emergence of magnetic flux leading to bursts of flares (C to M and even X-class). We investigate the violent events occurring in the cluster of two active regions (ARs), NOAA numbers 11121 and 11123, observed in November 2010 with instruments onboard the Solar Dynamics Observatory and from Earth. Within one day the total magnetic flux increased by 70 % with the emergence of new groups of bipoles in AR 11123. From all the events on 11 November, we study, in particular, the ones starting at around 07:16 UT in GOES soft X-ray data and the brightenings preceding them. A magnetic-field topological analysis indicates the presence of null points, associated separatrices, and quasi-separatrix layers (QSLs) where magnetic reconnection is prone to occur. The presence of null points is confirmed by a linear and a non-linear force-free magnetic-field model. Their locations and general characteristics are similar in both modelling approaches, which supports their robustness. However, in order to explain the full extension of the analysed event brightenings, which are not restricted to the photospheric traces of the null separatrices, we compute the locations of QSLs. Based on this more complete topological analysis, we propose a scenario to explain the origin of a low-energy event preceding a filament eruption, which is accompanied by a two-ribbon flare, and a consecutive confined flare in AR 11123. The results of our topology computation can also explain the locations of flare ribbons in two other events, one preceding and one following the ones at 07:16 UT. Finally, this study provides further examples where flare-ribbon locations can be explained when compared to QSLs and only, partially, when using separatrices. © 2013 Springer Science+Business Media Dordrecht.
title Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
title_short Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
title_full Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
title_fullStr Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
title_full_unstemmed Topological Analysis of Emerging Bipole Clusters Producing Violent Solar Events
title_sort topological analysis of emerging bipole clusters producing violent solar events
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v289_n6_p2041_Mandrini
http://hdl.handle.net/20.500.12110/paper_00380938_v289_n6_p2041_Mandrini
_version_ 1768545776205561856

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