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Fletcher, L.; López Fuentes, M.C.; Mandrini, C.H.; Schmieder, B.; Démoulin, P.; Mason, H.E.; Young, P.R.; Nitta, N. "A relationship between transition region brightenings, abundances, and magnetic topology" (2001) Solar Physics. 203(2):255-287
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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.

Registro:

Documento: Artículo
Título:A relationship between transition region brightenings, abundances, and magnetic topology
Autor:Fletcher, L.; López Fuentes, M.C.; Mandrini, C.H.; Schmieder, B.; Démoulin, P.; Mason, H.E.; Young, P.R.; Nitta, N.
Filiación:Lockheed Martin Solar Astrophys. L., Org L9-41, B252, 2351 Hanover Street, Palo Alto, CA 94306, United States
Inst. Astronomia y Fis. del Espacio, IAFE, CC67, Suc 28, 1428 Buenos Aires, Argentina
Observatoire de Paris, 92195 Meudon, Cedex Principal, France
Dept. Appl. Math. and Theor. Phys., Cambridge University, Silver Street, Cambridge CA, United Kingdom
Harvard Smithsonian Ctr. Astrophys., 60 Garden St., Cambridge, MA 02138, United States
Dept. of Astronomy and Astrophysics, University of Glasgow, Glasgow G12 8QQ, United Kingdom
Año:2001
Volumen:203
Número:2
Página de inicio:255
Página de fin:287
DOI: http://dx.doi.org/10.1023/A:1013302317042
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v203_n2_p255_Fletcher

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Citas:

---------- APA ----------
Fletcher, L., López Fuentes, M.C., Mandrini, C.H., Schmieder, B., Démoulin, P., Mason, H.E., Young, P.R.,..., Nitta, N. (2001) . A relationship between transition region brightenings, abundances, and magnetic topology. Solar Physics, 203(2), 255-287.
http://dx.doi.org/10.1023/A:1013302317042
---------- CHICAGO ----------
Fletcher, L., López Fuentes, M.C., Mandrini, C.H., Schmieder, B., Démoulin, P., Mason, H.E., et al. "A relationship between transition region brightenings, abundances, and magnetic topology" . Solar Physics 203, no. 2 (2001) : 255-287.
http://dx.doi.org/10.1023/A:1013302317042
---------- MLA ----------
Fletcher, L., López Fuentes, M.C., Mandrini, C.H., Schmieder, B., Démoulin, P., Mason, H.E., et al. "A relationship between transition region brightenings, abundances, and magnetic topology" . Solar Physics, vol. 203, no. 2, 2001, pp. 255-287.
http://dx.doi.org/10.1023/A:1013302317042
---------- VANCOUVER ----------
Fletcher, L., López Fuentes, M.C., Mandrini, C.H., Schmieder, B., Démoulin, P., Mason, H.E., et al. A relationship between transition region brightenings, abundances, and magnetic topology. Sol. Phys. 2001;203(2):255-287.
http://dx.doi.org/10.1023/A:1013302317042