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dc.contributor.author
Fletcher, Lindsay
dc.contributor.author
Lopez Fuentes, Marcelo Claudio
dc.contributor.author
Mandrini, Cristina Hemilse
dc.contributor.author
Schmieder, Brigitte
dc.contributor.author
Démoulin, Pascal
dc.contributor.author
Mason, Helen E.
dc.contributor.author
Young, Peter R.
dc.contributor.author
Nitta, Nariaki
dc.date.available
2017-08-15T17:45:07Z
dc.date.issued
2001-11
dc.identifier.citation
Fletcher, Lindsay; Lopez Fuentes, Marcelo Claudio; Mandrini, Cristina Hemilse; Schmieder, Brigitte; Démoulin, Pascal; et al.; A Relationship Between Transition Region Brightenings, Abundances, and Magnetic Topology; Springer; Solar Physics; 203; 2; 11-2001; 255-287
dc.identifier.issn
0038-0938
dc.identifier.uri
http://hdl.handle.net/11336/22488
dc.description.abstract
We present multi-instrument observations of active region (AR) 8048, made between 3 June and 5 June 1997, as part of the SOHO Joint Observing Program 33. This AR has a sigmoid-like global shape and undergoes transient brightenings in both soft X-rays and transition region (TR) lines. We compute a magneto-hydrostatic model of the AR magnetic field, using as boundary condition the photospheric observations of SOHO/MDI. The computed large-scale magnetic field lines show that the large-scale sigmoid is formed by two sets of coronal loops. Shorter loops, associated with the core of the SXT emission, coincide with the loops observed in the hotter CDS lines. These loops reveal a gradient of temperature, from 2 MK at the top to 1 MK at the ends. The field lines most closely matching these hot loops extend along the quasi-separatrix layers (QSLs) of the computed coronal field. The TR brightenings observed with SOHO/CDS can also be associated with the magnetic field topology, both QSL intersections with the photosphere, and places where separatrices issuing from bald patches (sites where field lines coming from the corona are tangent to the photosphere) intersect the photosphere. There are, furthermore, suggestions that the element abundances measured in the TR may depend on the type of topological structure present. Typically, the TR brightenings associated with QSLs have coronal abundances, while those associated with BP separatrices have abundances closer to photospheric values. We suggest that this difference is due to the location and manner in which magnetic reconnection occurs in two different topological structures.
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
Euv Brightenings
dc.subject
Coronal Abundances
dc.subject
Solar Magnetic Fields
dc.subject
Magnetic Topology
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
A Relationship Between Transition Region Brightenings, Abundances, and Magnetic Topology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-08-14T17:44:38Z
dc.journal.volume
203
dc.journal.number
2
dc.journal.pagination
255-287
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
Fil: Fletcher, Lindsay. Lockheed Martin Solar and Astrophysics Laboratory; Estados Unidos
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
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: Schmieder, Brigitte. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Mason, Helen E.. University of Cambridge; Reino Unido
dc.description.fil
Fil: Young, Peter R.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil
Fil: Nitta, Nariaki. Lockheed Martin Solar and Astrophysics Laboratory; Estados Unidos
dc.journal.title
Solar Physics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1023/A:1013302317042
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1023/A:1013302317042


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