Three dimensional reconstruction of the density and temperature along AR loops based on high resolution AIA data

NUEVO, FEDERICO A.; MANDRINI, CRISTINA H.; ALBERTO M. VASQUEZ; LÓPEZ FUENTES, MARCELO

Cartagena de India

Simposio; IAU Symposium 327; 2016

IAU

Due to their characteristic temperature and density, some magnetic flux tubes in active regions (ARs) can be directly seen as bright loop structures in extreme ultraviolet (EUV) and soft X-ray images. The observational determination of the three-dimensional (3D) distribution of basic physical parameters (electronic density and temperature, and magnetic field) is a fundamental constraint for coronal heating models. In this work we develop a technique of differential emission measure (DEM) analysis and we apply it to an ensemble of EUV loops identified in images obtained with the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). The local DEM in points along the loops is determined after background subtraction and the electronic density and temperature in the loop are estimated from its moments. The 3D structure and intensity of the magnetic field that correspond to the observed EUV loops are modeled using linear force free field (LFFF) extrapolations based on AR magnetograms. In this work we show the results for several ARs and discuss them in the context of coronal heating models.