Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds

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Magnetic clouds are the interplanetary manifestation of coronal mass ejections, which are transient expulsions of major quantities of magnetized plasma, from the Sun toward the heliosphere. The magnetic flux and helicity are two key physical magnitudes to track solar structures from the photosphere-...

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Detalles Bibliográficos
Autores principales: Dasso, S., Gulisano, A.M., Mandrini, C.H., Démoulin, P.
Formato: JOUR
Materias:
Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Magnetohydrodynamics
Solar wind
Astrophysics
Magnetic flux
Mathematical models
Plasmas
Solar system
Spacecraft
Wind
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02731177_v35_n12_p2172_Dasso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02731177_v35_n12_p2172_Dasso
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spelling todo:paper_02731177_v35_n12_p2172_Dasso2023-10-03T15:15:33Z Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds Dasso, S. Gulisano, A.M. Mandrini, C.H. Démoulin, P. Astrophysical plasmas Interplanetary medium Magnetic clouds Magnetic helicity Magnetohydrodynamics Solar wind Astrophysics Magnetic flux Mathematical models Plasmas Solar system Spacecraft Wind Astrophysical plasmas Interplanetary medium Magnetic clouds Magnetic helicity Solar wind Magnetohydrodynamics Magnetic clouds are the interplanetary manifestation of coronal mass ejections, which are transient expulsions of major quantities of magnetized plasma, from the Sun toward the heliosphere. The magnetic flux and helicity are two key physical magnitudes to track solar structures from the photosphere-corona to the interplanetary medium. To determine the content of flux and helicity in magnetic clouds, we have to know their 3D structure. However, since spacecrafts register data along a unique direction, several aspects of their global configuration cannot be observed. We present a method to estimate the magnetic flux and the magnetic helicity per unit length in magnetic clouds, directly from in situ magnetic observations, assuming only a cylindrical symmetry for the magnetic field configuration in the observed cross-section of the cloud. We select a set of 20 magnetic clouds observed by the spacecraft Wind and estimate their magnetic flux and their helicity per unit length. We compare the results obtained from our direct method with those obtained under the assumption of a helical linear force-free field. This direct method improves previous estimations of helicity in clouds. © 2005 COSPAR. Published by Elsevier Ltd. All rights reserved. Fil:Dasso, S. 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:Mandrini, C.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v35_n12_p2172_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 Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Magnetohydrodynamics
Solar wind
Astrophysics
Magnetic flux
Mathematical models
Plasmas
Solar system
Spacecraft
Wind
Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Solar wind
Magnetohydrodynamics
spellingShingle Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Magnetohydrodynamics
Solar wind
Astrophysics
Magnetic flux
Mathematical models
Plasmas
Solar system
Spacecraft
Wind
Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Solar wind
Magnetohydrodynamics
Dasso, S.
Gulisano, A.M.
Mandrini, C.H.
Démoulin, P.
Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
topic_facet Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Magnetohydrodynamics
Solar wind
Astrophysics
Magnetic flux
Mathematical models
Plasmas
Solar system
Spacecraft
Wind
Astrophysical plasmas
Interplanetary medium
Magnetic clouds
Magnetic helicity
Solar wind
Magnetohydrodynamics
description Magnetic clouds are the interplanetary manifestation of coronal mass ejections, which are transient expulsions of major quantities of magnetized plasma, from the Sun toward the heliosphere. The magnetic flux and helicity are two key physical magnitudes to track solar structures from the photosphere-corona to the interplanetary medium. To determine the content of flux and helicity in magnetic clouds, we have to know their 3D structure. However, since spacecrafts register data along a unique direction, several aspects of their global configuration cannot be observed. We present a method to estimate the magnetic flux and the magnetic helicity per unit length in magnetic clouds, directly from in situ magnetic observations, assuming only a cylindrical symmetry for the magnetic field configuration in the observed cross-section of the cloud. We select a set of 20 magnetic clouds observed by the spacecraft Wind and estimate their magnetic flux and their helicity per unit length. We compare the results obtained from our direct method with those obtained under the assumption of a helical linear force-free field. This direct method improves previous estimations of helicity in clouds. © 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
format JOUR
author Dasso, S.
Gulisano, A.M.
Mandrini, C.H.
Démoulin, P.
author_facet Dasso, S.
Gulisano, A.M.
Mandrini, C.H.
Démoulin, P.
author_sort Dasso, S.
title Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
title_short Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
title_full Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
title_fullStr Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
title_full_unstemmed Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
title_sort model-independent large-scale magnetohydrodynamic quantities in magnetic clouds
url http://hdl.handle.net/20.500.12110/paper_02731177_v35_n12_p2172_Dasso
work_keys_str_mv AT dassos modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds
AT gulisanoam modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds
AT mandrinich modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds
AT demoulinp modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds
_version_ 1807321798659801088

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