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Are constant loop widths an artifact of the background and the spatial resolution? View all abstracts by submitter

Marcelo Lopez-Fuentes   Submitted: 2007-04-10 08:05

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 (Lopez Fuentes, Klimchuk & Demoulin 2006) 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. We find no statistical correlation between variations of the measured width and of the background. Therefore, we confirm that the background does not significantly influence the determination of the overall expansion properties of loops.

Authors: M.C. Lopez Fuentes, P. Demoulin, J.A. Klimchuk
Projects: None

Publication Status: Submitted to ApJ
Last Modified: 2007-04-10 09:03
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