Análisis DEM 3D de arcos en regiones activas solares

NUEVO, F.A.; MANDRINI, C.H.; VÁSQUEZ, A.M.; LÓPEZ FUENTES, M.C.

Congreso; 58va Reunión Anual de la Asociación Argentina de Astronomía; 2015

The solar corona is highly organized by the magnetic field. Because oftheir temperature and density, magnetic loops are directly observable inactive regions (ARs) in the extreme ultraviolet (EUV) and soft X-rayimages. The observational determination of the three-dimensional (3D)distribution of basic physical parameters (electronic density andtemperature, and magnetic field) is a fundamental constraint of coronalheating models. In this work we develop a technique of differentialemission measure (DEM) analysis and we apply it an EUV loop identifiedin the images of the Atmospheric Imaging Assembly (AIA) on board theSolar Dynamics Observatory (SDO). The DEM is determined after backgroundsubtraction and the electronic density and temperature in the loop areestimated from its moments. The 3D structure of the magnetic field inthe loop and its intensity are modeled using linear force free fieldextrapolations based on AR magnetograms. In this work we showpreliminary results of this technique.