Wednesday

There are several semi-empirical models to describe the structure of the solar atmosphere currently in the literature. These models help us to describe the distribution of the physical quantities along the coronal loops. However, the loop geometry influences the quantities values describing their physical structure, i.e., pressure and temperature. Thus, the accuracy in the determination of the loops geometry must be as high as possible. Here, we reproduce the loop geometry through extrapolation of magnetic field lines by using linear and nonlinear models and a method involving data from the STEREO and AIA instruments. The applicability of the last method is only for active regions at the limb of the solar disk. After that, we adjust several semi-empirical models to the loop shape obtained. We compare their incidence on the estimation of the physical parameters describing the loop structure.