Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds

Magnetic clouds (MCs) are a subset of interplanetary coronal mass ejections (ICMEs), which carry a significant amount of large scale magnetic helicity (MH) away from the solar corona as they travel to the external heliosphere. From a theoretical point of view, it is expected that MH be preserved in...

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Autores principales:	Dasso, Sergio Ricardo, Mandrini, Cristina Hemilse, Luoni, Maria Luisa, Gulisano, Adriana María, Nakwacki, Maria Soledad
Publicado:	2005
Materias:	Magnetic clouds Magnetic helicity Solar ejections Magnetic fields Planets Solar radiation Magnetic properties
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n592_p605_Dasso http://hdl.handle.net/20.500.12110/paper_03796566_v_n592_p605_Dasso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03796566_v_n592_p605_Dasso
record_format	dspace
spelling	paper:paper_03796566_v_n592_p605_Dasso2023-06-08T15:40:44Z Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds Dasso, Sergio Ricardo Mandrini, Cristina Hemilse Luoni, Maria Luisa Gulisano, Adriana María Nakwacki, Maria Soledad Magnetic clouds Magnetic helicity Solar ejections Magnetic fields Planets Solar radiation Magnetic clouds Magnetic helicity Solar ejections Magnetic properties Magnetic clouds (MCs) are a subset of interplanetary coronal mass ejections (ICMEs), which carry a significant amount of large scale magnetic helicity (MH) away from the solar corona as they travel to the external heliosphere. From a theoretical point of view, it is expected that MH be preserved in the solar corona and the heliosphere. In particular, it will be preserved in MCs during their evolution through the interplanetary medium. Thus, MH plays a key role to link the magnetic properties of MCs with their solar active region (AR) sources, helping us to improve the knowledge of the ejection mechanisms in the corona. MH studies permit also to restrict the various models proposed to represent the structure of clouds. We present here a new method to compute the MH in clouds, which provides values for the helicity per unit length along the flux tube axis using the observed interplanetary magnetic field. The method only assumes that the cloud section is circular. We apply this method to two MCs, one of the biggest and one of the smallest ever observed, and compare our results with the helicity ejected from their respective solar sources. Fil:Dasso, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mandrini, C.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Luoni, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gulisano, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Nakwacki, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n592_p605_Dasso http://hdl.handle.net/20.500.12110/paper_03796566_v_n592_p605_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	Magnetic clouds Magnetic helicity Solar ejections Magnetic fields Planets Solar radiation Magnetic clouds Magnetic helicity Solar ejections Magnetic properties
spellingShingle	Magnetic clouds Magnetic helicity Solar ejections Magnetic fields Planets Solar radiation Magnetic clouds Magnetic helicity Solar ejections Magnetic properties Dasso, Sergio Ricardo Mandrini, Cristina Hemilse Luoni, Maria Luisa Gulisano, Adriana María Nakwacki, Maria Soledad Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
topic_facet	Magnetic clouds Magnetic helicity Solar ejections Magnetic fields Planets Solar radiation Magnetic clouds Magnetic helicity Solar ejections Magnetic properties
description	Magnetic clouds (MCs) are a subset of interplanetary coronal mass ejections (ICMEs), which carry a significant amount of large scale magnetic helicity (MH) away from the solar corona as they travel to the external heliosphere. From a theoretical point of view, it is expected that MH be preserved in the solar corona and the heliosphere. In particular, it will be preserved in MCs during their evolution through the interplanetary medium. Thus, MH plays a key role to link the magnetic properties of MCs with their solar active region (AR) sources, helping us to improve the knowledge of the ejection mechanisms in the corona. MH studies permit also to restrict the various models proposed to represent the structure of clouds. We present here a new method to compute the MH in clouds, which provides values for the helicity per unit length along the flux tube axis using the observed interplanetary magnetic field. The method only assumes that the cloud section is circular. We apply this method to two MCs, one of the biggest and one of the smallest ever observed, and compare our results with the helicity ejected from their respective solar sources.
author	Dasso, Sergio Ricardo Mandrini, Cristina Hemilse Luoni, Maria Luisa Gulisano, Adriana María Nakwacki, Maria Soledad
author_facet	Dasso, Sergio Ricardo Mandrini, Cristina Hemilse Luoni, Maria Luisa Gulisano, Adriana María Nakwacki, Maria Soledad
author_sort	Dasso, Sergio Ricardo
title	Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
title_short	Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
title_full	Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
title_fullStr	Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
title_full_unstemmed	Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds
title_sort	linking coronal to heliospheric magnetic helicity: a new model-independent technique to compute helicity in magnetic clouds
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n592_p605_Dasso http://hdl.handle.net/20.500.12110/paper_03796566_v_n592_p605_Dasso
work_keys_str_mv	AT dassosergioricardo linkingcoronaltoheliosphericmagnetichelicityanewmodelindependenttechniquetocomputehelicityinmagneticclouds AT mandrinicristinahemilse linkingcoronaltoheliosphericmagnetichelicityanewmodelindependenttechniquetocomputehelicityinmagneticclouds AT luonimarialuisa linkingcoronaltoheliosphericmagnetichelicityanewmodelindependenttechniquetocomputehelicityinmagneticclouds AT gulisanoadrianamaria linkingcoronaltoheliosphericmagnetichelicityanewmodelindependenttechniquetocomputehelicityinmagneticclouds AT nakwackimariasoledad linkingcoronaltoheliosphericmagnetichelicityanewmodelindependenttechniquetocomputehelicityinmagneticclouds
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Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds

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