Initiation of CMEs: The role of magnetic twist

Recent multiwavelength observations, modelling results and theoretical developments indicate the importance of twisted magnetic configurations in solar active regions (ARs) in the initiation of coronal mass ejections (CMEs). Through multiwavelength analysis of a few representative events we make an...

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Guardado en:
Detalles Bibliográficos
Publicado: 2000
Materias:
Coronal mass ejections
Magnetic twist
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v62_n16_p1437_VanDrielGesztelyi
http://hdl.handle.net/20.500.12110/paper_13646826_v62_n16_p1437_VanDrielGesztelyi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13646826_v62_n16_p1437_VanDrielGesztelyi
record_format dspace
spelling paper:paper_13646826_v62_n16_p1437_VanDrielGesztelyi2023-06-08T16:11:51Z Initiation of CMEs: The role of magnetic twist Coronal mass ejections Magnetic twist Recent multiwavelength observations, modelling results and theoretical developments indicate the importance of twisted magnetic configurations in solar active regions (ARs) in the initiation of coronal mass ejections (CMEs). Through multiwavelength analysis of a few representative events we make an attempt to provide constraints for CME models. The two events presented here in detail start with the expansion of sigmoids (S- or inverse S-shaped loops) observed in soft X-rays. Both events (on 25 October 1994 and 14 October 1995) occurred before the launch of the SOHO spacecraft, but indirect evidences (i.e. signatures of an outward propagation traced up to ≈20 solar radii and an associated magnetic cloud) suggest that both of them were related to CMEs. We show evidence that sigmoids are the coronal manifestations of twisted magnetic flux tubes, which start expanding presumably due to a loss of equilibrium. It is noteworthy that the analysed CMEs occurred in a complex (not simply bipolar) magnetic environment and in all cases we found evidences of the interaction (magnetic reconnection) with the surrounding fields. We propose a scenario for sigmoid expansion related CME events and suggest that twisted magnetic configurations are good candidates for being source regions of CMEs. © 2000 Elsevier Science B.V. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v62_n16_p1437_VanDrielGesztelyi http://hdl.handle.net/20.500.12110/paper_13646826_v62_n16_p1437_VanDrielGesztelyi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Coronal mass ejections
Magnetic twist
spellingShingle Coronal mass ejections
Magnetic twist
Initiation of CMEs: The role of magnetic twist
topic_facet Coronal mass ejections
Magnetic twist
description Recent multiwavelength observations, modelling results and theoretical developments indicate the importance of twisted magnetic configurations in solar active regions (ARs) in the initiation of coronal mass ejections (CMEs). Through multiwavelength analysis of a few representative events we make an attempt to provide constraints for CME models. The two events presented here in detail start with the expansion of sigmoids (S- or inverse S-shaped loops) observed in soft X-rays. Both events (on 25 October 1994 and 14 October 1995) occurred before the launch of the SOHO spacecraft, but indirect evidences (i.e. signatures of an outward propagation traced up to ≈20 solar radii and an associated magnetic cloud) suggest that both of them were related to CMEs. We show evidence that sigmoids are the coronal manifestations of twisted magnetic flux tubes, which start expanding presumably due to a loss of equilibrium. It is noteworthy that the analysed CMEs occurred in a complex (not simply bipolar) magnetic environment and in all cases we found evidences of the interaction (magnetic reconnection) with the surrounding fields. We propose a scenario for sigmoid expansion related CME events and suggest that twisted magnetic configurations are good candidates for being source regions of CMEs. © 2000 Elsevier Science B.V.
title Initiation of CMEs: The role of magnetic twist
title_short Initiation of CMEs: The role of magnetic twist
title_full Initiation of CMEs: The role of magnetic twist
title_fullStr Initiation of CMEs: The role of magnetic twist
title_full_unstemmed Initiation of CMEs: The role of magnetic twist
title_sort initiation of cmes: the role of magnetic twist
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v62_n16_p1437_VanDrielGesztelyi
http://hdl.handle.net/20.500.12110/paper_13646826_v62_n16_p1437_VanDrielGesztelyi
_version_ 1768545570297741312

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