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Artículo

Are constant loop widths an artifact of the background and the spatial resolution?

Lopez Fuentes, Marcelo ClaudioIcon ; Démoulin, Pascal; Klimchuk, J. A.
Fecha de publicación: 12/2008
Editorial: IOP Publishing
Revista: Astrophysical Journal
ISSN: 0004-637X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We study the effect of the coronal background in the determination of the diameter of EUV loops, and we analyze the suitability of the procedure followed in a previous paper for characterizing their expansion properties. For the analysis we create different synthetic loops, and we place them on real backgrounds from data obtained with the Transition Region and Coronal Explorer (TRACE). We apply to these loops the same procedure followed in our previous works, and we compare the results with real loop observations. We demonstrate that the procedure allows us to distinguish constant width loops from loops that expand appreciably with height, as predicted by simple force-free field models. This holds even for loops near the resolution limit. The procedure can easily determine when loops are below the resolution limit and therefore not reliably measured. We find that small-scale variations in the measured loop width are likely due to imperfections in the background subtraction. The greatest errors occur in especially narrow loops and in places where the background is especially bright relative to the loop. We stress, however, that these effects do not impact the ability to measure large-scale variations. The result that observed loops do not expand systematically with height is robust
Palabras clave: Sun: Corona , Sun: Magnetic Fields , Sun: Uv Radiation
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/20817
URL: http://iopscience.iop.org/article/10.1086/523928
DOI: http://dx.doi.org/10.1086/523928
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Lopez Fuentes, Marcelo Claudio; Démoulin, Pascal; Klimchuk, J. A.; Are constant loop widths an artifact of the background and the spatial resolution?; IOP Publishing; Astrophysical Journal; 673; 1; 12-2008; 586-597
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