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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Autores principales:	Dasso, Sergio Ricardo, Gulisano, Adriana María, Mandrini, Cristina Hemilse
Publicado:	2005
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:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v35_n12_p2172_Dasso 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	paper:paper_02731177_v35_n12_p2172_Dasso
record_format	dspace
spelling	paper:paper_02731177_v35_n12_p2172_Dasso2023-06-08T15:25:32Z Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds Dasso, Sergio Ricardo Gulisano, Adriana María Mandrini, Cristina Hemilse 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. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v35_n12_p2172_Dasso 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, Sergio Ricardo Gulisano, Adriana María Mandrini, Cristina Hemilse 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.
author	Dasso, Sergio Ricardo Gulisano, Adriana María Mandrini, Cristina Hemilse
author_facet	Dasso, Sergio Ricardo Gulisano, Adriana María Mandrini, Cristina Hemilse
author_sort	Dasso, Sergio Ricardo
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
publishDate	2005
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v35_n12_p2172_Dasso http://hdl.handle.net/20.500.12110/paper_02731177_v35_n12_p2172_Dasso
work_keys_str_mv	AT dassosergioricardo modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds AT gulisanoadrianamaria modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds AT mandrinicristinahemilse modelindependentlargescalemagnetohydrodynamicquantitiesinmagneticclouds
_version_	1768544728354127872

Model-independent large-scale magnetohydrodynamic quantities in magnetic clouds

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