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dc.contributor.author
Mandrini, Cristina Hemilse
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Démoulin, Pascal
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van Driel Gesztelyi, Lidia
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Green, L. M.
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Lopez Fuentes, Marcelo Claudio
dc.date.available
2017-08-11T17:21:22Z
dc.date.issued
2004-12
dc.identifier.citation
Mandrini, Cristina Hemilse; Démoulin, Pascal; van Driel Gesztelyi, Lidia; Green, L. M.; Lopez Fuentes, Marcelo Claudio; Magnetic Helicity Budget of Solar-Active Regions from the Photosphere to Magnetic Clouds; Springer; Astrophysics And Space Science; 290; 3-4; 12-2004; 319-344
dc.identifier.issn
0004-640X
dc.identifier.uri
http://hdl.handle.net/11336/22193
dc.description.abstract
We have analyzed the long-term evolution of two active regions (ARs) from their emergence through their decay using observations from several instruments on board SoHO (MDI, EIT and LASCO) and Yohkoh/SXT. We have computed the evolution of the relative coronal magnetic helicity combining data from MDI and SXT with a linear force-free model of the coronal magnetic field. Next, we have computed the injection of helicity by surface differential rotation using MDI magnetic maps. To estimate the depletion of helicity we have counted all the CMEs of which these ARs have been the source, and we have evaluated their magnetic helicity assuming a one to one correspondence with magnetic clouds with an average helicity contain. When these three values (variation of coronal magnetic helicity, injection by differential rotation and ejection via CMEs) are compared, we find that surface differential rotation is a minor contributor to the helicity budget since CMEs carry away at least 10 times more helicity than the one differential rotation can provide. Therefore, the magnetic helicity flux needed in the global balance should come from localized photospheric motions that, at least partially, reflect the emergence of twisted flux tubes.We estimate that the total helicity carried away in CMEs can be provided by the end-to-end helicity of the flux tubes forming these ARs.Therefore, we conclude that most of the helicity ejected in CMEs is generated below the photosphere and emerges with the magnetic flux.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Magnetic Helicity Budget of Solar-Active Regions
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Magnetic Helicity Budget of Solar-Active Regions from the Photosphere to Magnetic Clouds
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-08-10T14:08:18Z
dc.journal.volume
290
dc.journal.number
3-4
dc.journal.pagination
319-344
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
Fil: Mandrini, Cristina Hemilse. 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
dc.description.fil
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Green, L. M.. Mullard Space Science Laboratory; Reino Unido
dc.description.fil
Fil: Lopez Fuentes, Marcelo Claudio. 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. Spece Sciences División. Naval Research Laboratory; Estados Unidos
dc.journal.title
Astrophysics And Space Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1023/B:ASTR.0000032533.31817.0e
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1023/B:ASTR.0000032533.31817.0e
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