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dc.contributor.author
Démoulin, Pascal
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dc.contributor.author
Baker, D.
dc.contributor.author
Mandrini, Cristina Hemilse
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dc.contributor.author
van Driel Gesztelyi, Lidia
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dc.date.available
2017-05-26T21:52:03Z
dc.date.issued
2013-04
dc.identifier.citation
Démoulin, Pascal; Baker, D.; Mandrini, Cristina Hemilse; van Driel Gesztelyi, Lidia; The 3D geometry of active region upflows deduced from their limb-to-limb evolution; Springer; Solar Physics; 283; 2; 4-2013; 341-367
dc.identifier.issn
0038-0938
dc.identifier.uri
http://hdl.handle.net/11336/17032
dc.description.abstract
We analyze the evolution of coronal plasma upflows from the edges of AR 10978, which has the best limb-to-limb data coverage with Hinode’s EUV Imaging Spectrometer (EIS). We find that the observed evolution is largely due to the solar rotation progressively changing the viewpoint of nearly stationary flows. From the systematic changes in the upflow regions as a function of distance from disc center, we deduce their 3D geometrical properties as inclination and angular spread in three coronal lines (Si vii, Fe xii, and Fe xv). In agreement with magnetic extrapolations, we find that the flows are thin, fan-like structures rooted in quasi separatrix layers (QSLs). The fans are tilted away from the AR center. The highest plasma velocities in these three spectral lines have similar magnitudes and their heights increase with temperature. The spatial location and extent of the upflow regions in the Si vii, Fe xii, and Fe xv lines are different owing to i) temperature stratification and ii) line of sight integration of the spectral profiles with significantly different backgrounds. We conclude that we sample the same flows at different temperatures. Further, we find that the evolution of line widths during the disc passage is compatible with a broad range of velocities in the flows. Everything considered, our results are compatible with the AR upflows originating from reconnections along QSLs between over-pressure AR loops and neighboring under-pressure loops. The flows are driven along magnetic field lines by a pressure gradient in a stratified atmosphere. Our interpretation of the above results is that, at any given time, we observe the superposition of flows created by successive reconnections, leading to a broad velocity distribution.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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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
Active Regions, Magnetic Fields
dc.subject
Active Regions, Velocity Fields
dc.subject
Corona, Active
dc.subject
Spectral Line, Broadening
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
The 3D geometry of active region upflows deduced from their limb-to-limb evolution
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-23T19:16:16Z
dc.identifier.eissn
1573-093X
dc.journal.volume
283
dc.journal.number
2
dc.journal.pagination
341-367
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Dorcrecht
dc.description.fil
Fil: Démoulin, Pascal. Centre National de la Recherche Scientifique. Observatoire de Paris; Francia
dc.description.fil
Fil: Baker, D.. UCL-Mullard Space Science Laboratory; Reino Unido
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. Konkoly Observatory; Hungría
dc.journal.title
Solar Physics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s11207-013-0234-7
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s11207-013-0234-7
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/1211.5962
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