Modelling of quiet-Sun coronal loops in thermodynamic equilibrium

CECILIA MAC CORMACK; MARCELO LOPEZ FUENTES; CRISTINA H. MANDRINI; DIEGO G. LLOVERAS; ALBERTO M. VASQUEZ

Viedma

Congreso; 61 Reunión anual de la Asociación Argentina de Astronomía; 2019

In order to have thermodynamically stable loops, at typical million-degree coronal temperatures, some heating mechanism is necessary to compensate for the energetic loses observed along the loops. In a previous work, we developed a procedure to estimate, using differential emission measure tomography in combination with global coronal magnetic field extrapolations (DEMT-PFSS), the energy input flux at the loops coronal base.In this work, we use that energy flux computation to model quiet-sun coronal loops with the 0D hydrodynamic model, enthalpy-Based thermal evolution of loops (EBTEL). We compare the obtained results with the thermal properties of coronal loops reconstructed with the DEMT-PFSS technique. Although we found similar temperature distributions with DEMT and EBTEL, densities are a factor of two smaller for the EBTEL model. The cause of this apparent inconsistency is that the energy balance assumed in the tomographic procedure only considers the coronal portion of the loop, while EBTEL also includes the role of the transition region.