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dc.contributor.author
Démoulin, Pascal
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dc.contributor.author
Mandrini, Cristina Hemilse
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dc.contributor.author
van Driel Gesztelyi, Lidia
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dc.contributor.author
Thompson, B. J.
dc.contributor.author
Plunkett, S.
dc.contributor.author
Kovári, Zs.
dc.contributor.author
Aulanier, G.
dc.contributor.author
Young, A.
dc.date.available
2017-08-15T14:58:49Z
dc.date.issued
2002-02
dc.identifier.citation
Démoulin, Pascal; Mandrini, Cristina Hemilse; van Driel Gesztelyi, Lidia; Thompson, B. J.; Plunkett, S.; et al.; What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978; EDP Sciences; Astronomy and Astrophysics; 382; 2; 2-2002; 650-665
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/22443
dc.description.abstract
An isolated active region (AR) was observed on the Sun during seven rotations, starting from its birth in July 1996 to its full dispersion in December 1996. We analyse the long-term budget of the AR relative magnetic helicity. Firstly, we calculate the helicity injected by differential rotation at the photospheric level using MDI/SoHO magnetograms. Secondly, we compute the coronal magnetic field and its helicity selecting the model which best fits the soft X-ray loops observed with SXT/Yohkoh. Finally, we identify all the coronal mass ejections (CMEs) that originated from the AR during its lifetime using LASCO and EIT/SoHO. Assuming a one to one correspondence between CMEs and magnetic clouds, we estimate the magnetic helicity which could be shed via CMEs. We find that differential rotation can neither provide the required magnetic helicity to the coronal field (at least a factor 2.5 to 4 larger), nor to the field ejected to the interplanetary space (a factor 4 to 20 larger), even in the case of this AR for which the total helicity injected by differential rotation is close to the maximum possible value. However, the total helicity ejected is equivalent to that of a twisted flux tube having the same magnetic flux as the studied AR and a number of turns in the interval [0.5,2.0]. We suggest that the main source of helicity is the inherent twist of the magnetic flux tube forming the active region. This magnetic helicity is transferred to the corona either by the continuous emergence of the flux tube for several solar rotations (i.e. on a time scale much longer than the classical emergence phase), or by torsional Alfvén waves.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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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 Corona
dc.subject
Coronal Mass Ejections
dc.subject
Solar Magnetic Fields
dc.subject
Solar-Terrestrial Relations
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
What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-08-11T14:57:51Z
dc.journal.volume
382
dc.journal.number
2
dc.journal.pagination
650-665
dc.journal.pais
Francia
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dc.journal.ciudad
Paris
dc.description.fil
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
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: van Driel Gesztelyi, Lidia. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Thompson, B. J.. National Aeronautics and Space Administration. Goddart Institute for Space Studies; Estados Unidos
dc.description.fil
Fil: Plunkett, S.. Spece Sciences División. Naval Research Laboratory; Estados Unidos
dc.description.fil
Fil: Kovári, Zs.. Konkoly Observatory; Hungría
dc.description.fil
Fil: Aulanier, G.. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Young, A.. National Aeronautics and Space Administration. Goddart Institute for Space Studies; Estados Unidos
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361:20011634
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2002/05/aa1962/aa1962.html
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