Magnetic helicity analysis of an interplanetary twisted flux tube

We compute the magnetic flux and helicity of an interplanetary flux tube observed by the spacecraft Wind on 24-25 October 1995. We investigate how model-dependent are the results by determining the flux-tube orientation using two different methods (minimum variance and a simultaneous fit), and three...

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Guardado en:
Detalles Bibliográficos
Publicado: 2003
Materias:
Interplanetary coronal mass ejections
Interplanetary physics
Magnetic flux ropes
Magnetic helicity
Solar wind
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699402_v108_nA10_p_Dasso
http://hdl.handle.net/20.500.12110/paper_21699402_v108_nA10_p_Dasso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_21699402_v108_nA10_p_Dasso
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spelling paper:paper_21699402_v108_nA10_p_Dasso2023-06-08T16:34:53Z Magnetic helicity analysis of an interplanetary twisted flux tube Interplanetary coronal mass ejections Interplanetary physics Magnetic flux ropes Magnetic helicity Solar wind We compute the magnetic flux and helicity of an interplanetary flux tube observed by the spacecraft Wind on 24-25 October 1995. We investigate how model-dependent are the results by determining the flux-tube orientation using two different methods (minimum variance and a simultaneous fit), and three different models: a linear force-free field, a uniformly twisted field, and a nonforce-free field with constant current. We have fitted the set of free parameters for the six cases and have found that the two force-free models fit the data with very similar quality for both methods. Then, both the comparable computed parameters and global quantities, magnetic flux and helicity per unit length, agree to within 10% for the two force-free models. These results imply that the magnetic flux and helicity of the tube are well-determined quantities, nearly independent of the model used, provided that the fit to the data is good enough. Copyright 2003 by the American Geophysical Union. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699402_v108_nA10_p_Dasso http://hdl.handle.net/20.500.12110/paper_21699402_v108_nA10_p_Dasso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Interplanetary coronal mass ejections
Interplanetary physics
Magnetic flux ropes
Magnetic helicity
Solar wind
spellingShingle Interplanetary coronal mass ejections
Interplanetary physics
Magnetic flux ropes
Magnetic helicity
Solar wind
Magnetic helicity analysis of an interplanetary twisted flux tube
topic_facet Interplanetary coronal mass ejections
Interplanetary physics
Magnetic flux ropes
Magnetic helicity
Solar wind
description We compute the magnetic flux and helicity of an interplanetary flux tube observed by the spacecraft Wind on 24-25 October 1995. We investigate how model-dependent are the results by determining the flux-tube orientation using two different methods (minimum variance and a simultaneous fit), and three different models: a linear force-free field, a uniformly twisted field, and a nonforce-free field with constant current. We have fitted the set of free parameters for the six cases and have found that the two force-free models fit the data with very similar quality for both methods. Then, both the comparable computed parameters and global quantities, magnetic flux and helicity per unit length, agree to within 10% for the two force-free models. These results imply that the magnetic flux and helicity of the tube are well-determined quantities, nearly independent of the model used, provided that the fit to the data is good enough. Copyright 2003 by the American Geophysical Union.
title Magnetic helicity analysis of an interplanetary twisted flux tube
title_short Magnetic helicity analysis of an interplanetary twisted flux tube
title_full Magnetic helicity analysis of an interplanetary twisted flux tube
title_fullStr Magnetic helicity analysis of an interplanetary twisted flux tube
title_full_unstemmed Magnetic helicity analysis of an interplanetary twisted flux tube
title_sort magnetic helicity analysis of an interplanetary twisted flux tube
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699402_v108_nA10_p_Dasso
http://hdl.handle.net/20.500.12110/paper_21699402_v108_nA10_p_Dasso
_version_ 1768544616380891136

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