Are constant loop widths an artifact of the background and the spatial resolution?
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...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004637X_v673_n1_p586_LopezFuentes |
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todo:paper_0004637X_v673_n1_p586_LopezFuentes2023-10-03T14:02:06Z Are constant loop widths an artifact of the background and the spatial resolution? López Fuentes, M.C. Démoulin, P. Klimchuk, J.A. Sun: corona Sun: magnetic fields Sun: UV radiation 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. © 2008. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v673_n1_p586_LopezFuentes |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Sun: corona Sun: magnetic fields Sun: UV radiation |
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Sun: corona Sun: magnetic fields Sun: UV radiation López Fuentes, M.C. Démoulin, P. Klimchuk, J.A. Are constant loop widths an artifact of the background and the spatial resolution? |
| topic_facet |
Sun: corona Sun: magnetic fields Sun: UV radiation |
| description |
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. © 2008. The American Astronomical Society. All rights reserved. |
| format |
JOUR |
| author |
López Fuentes, M.C. Démoulin, P. Klimchuk, J.A. |
| author_facet |
López Fuentes, M.C. Démoulin, P. Klimchuk, J.A. |
| author_sort |
López Fuentes, M.C. |
| title |
Are constant loop widths an artifact of the background and the spatial resolution? |
| title_short |
Are constant loop widths an artifact of the background and the spatial resolution? |
| title_full |
Are constant loop widths an artifact of the background and the spatial resolution? |
| title_fullStr |
Are constant loop widths an artifact of the background and the spatial resolution? |
| title_full_unstemmed |
Are constant loop widths an artifact of the background and the spatial resolution? |
| title_sort |
are constant loop widths an artifact of the background and the spatial resolution? |
| url |
http://hdl.handle.net/20.500.12110/paper_0004637X_v673_n1_p586_LopezFuentes |
| work_keys_str_mv |
AT lopezfuentesmc areconstantloopwidthsanartifactofthebackgroundandthespatialresolution AT demoulinp areconstantloopwidthsanartifactofthebackgroundandthespatialresolution AT klimchukja areconstantloopwidthsanartifactofthebackgroundandthespatialresolution |
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1807324519984005120 |