IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The effect of the background in the determination of morphological properties of coronal loops
Autor/es:
M. C. LÓPEZ FUENTES; P. DÉMOULIN; J. A. KLIMCHUK
Lugar:
Santorini, Grecia
Reunión:
Workshop; Coronal Loops Workshop III; 2007
Institución organizadora:
Agencia Espacial Europea
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 (Lopez Fuentes, Klimchuk and 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.