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

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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, S., Mandrini, C.H., Luoni, M.L., Gulisano, A.M., Nakwacki, M.S., Pohjolainen, S., Van Driel-Gesztelyi, L., Démoulin, P.
Formato: CONF
Materias:
Magnetic clouds
Magnetic helicity
Solar ejections
Magnetic fields
Planets
Solar radiation
Magnetic properties
Acceso en línea: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 todo:paper_03796566_v_n592_p605_Dasso
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spelling todo:paper_03796566_v_n592_p605_Dasso2023-10-03T15:33:34Z Linking coronal to heliospheric magnetic helicity: A new model-independent technique to compute helicity in magnetic clouds Dasso, S. Mandrini, C.H. Luoni, M.L. Gulisano, A.M. Nakwacki, M.S. Pohjolainen, S. Van Driel-Gesztelyi, L. Démoulin, P. 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. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, S.
Mandrini, C.H.
Luoni, M.L.
Gulisano, A.M.
Nakwacki, M.S.
Pohjolainen, S.
Van Driel-Gesztelyi, L.
Démoulin, P.
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.
format CONF
author Dasso, S.
Mandrini, C.H.
Luoni, M.L.
Gulisano, A.M.
Nakwacki, M.S.
Pohjolainen, S.
Van Driel-Gesztelyi, L.
Démoulin, P.
author_facet Dasso, S.
Mandrini, C.H.
Luoni, M.L.
Gulisano, A.M.
Nakwacki, M.S.
Pohjolainen, S.
Van Driel-Gesztelyi, L.
Démoulin, P.
author_sort Dasso, S.
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
url http://hdl.handle.net/20.500.12110/paper_03796566_v_n592_p605_Dasso
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