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dc.contributor.author
Steed, K.
dc.contributor.author
Owen, C.J.
dc.contributor.author
Démoulin, Pascal
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dc.contributor.author
Dasso, Sergio Ricardo
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dc.date.available
2019-05-21T14:00:27Z
dc.date.issued
2011-01
dc.identifier.citation
Steed, K.; Owen, C.J.; Démoulin, Pascal; Dasso, Sergio Ricardo; Investigating the observational signatures of magnetic cloud substructure; Blackwell Publishing Ltd; Journal of Geophysical Research: Space Physics; 116; 1; 1-2011; 1106-1118
dc.identifier.issn
2169-9402
dc.identifier.uri
http://hdl.handle.net/11336/76775
dc.description.abstract
Magnetic clouds (MCs) represent a subset of interplanetary coronal mass ejections (ICMEs) that exhibit a magnetic flux rope structure. They are primarily identified by smooth, large-scale rotations of the magnetic field. However, both small- and large-scale fluctuations of the magnetic field are observed within some magnetic clouds. We analyzed the magnetic field in the frames of the flux ropes, approximated using a minimum variance analysis (MVA), and have identified a small number of MCs within which multiple reversals of the gradient of the azimuthal magnetic field are observed. We herein use the term "substructure" to refer to regions that exhibit this signature. We examine, in detail, one such MC observed on 13 April 2006 by the ACE and WIND spacecraft and show that substructure has distinct signatures in both the magnetic field and plasma observations. We identify two thin current sheets within the substructure and find that they bound the region in which the observations deviate most significantly from those typically expected in MCs. The majority of these clouds are followed by fast solar wind streams, and a comparison of the properties of this magnetic cloud with five similar events reveals that they have lower nondimensional expansion rates than nonovertaken magnetic clouds. We discuss and evaluate several possible explanations for this type of substructure, including the presence of multiple flux ropes and warping of the MC structure, but we conclude that none of these scenarios is able to fully explain all of the aspects of the substructure observations. Copyright 2011 by the American Geophysical Union.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Blackwell Publishing Ltd
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Solar Wind
dc.subject
Space Weather
dc.subject
Magnetic Clouds
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Investigating the observational signatures of magnetic cloud substructure
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-05-14T21:19:13Z
dc.journal.volume
116
dc.journal.number
1
dc.journal.pagination
1106-1118
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Nueva York
dc.description.fil
Fil: Steed, K.. Colegio Universitario de Londres; Reino Unido
dc.description.fil
Fil: Owen, C.J.. Colegio Universitario de Londres; Reino Unido
dc.description.fil
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Dasso, Sergio Ricardo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina
dc.journal.title
Journal of Geophysical Research: Space Physics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1029/2010JA015940
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