Modelling of quiet-Sun coronal loops in thermodynamic equilibrium

MARCELO LÓPEZ FUENTES; ALBERTO M. VÁSQUEZ; CRISTINA H. MANDRINI; CRISTINA H. MANDRINI; CECILIA MAC CORMACK; DIEGO G. LLOVERAS; CECILIA MAC CORMACK; DIEGO G. LLOVERAS; MARCELO LÓPEZ FUENTES; ALBERTO M. VÁSQUEZ

Viedma, Río Negro

Congreso; 61ava Reunión Anual de la Asociación Argentina de Astronomía; 2019

Asociación Argentina de Astronomía

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 previ-ous work, we developed a procedure to estimate, using differential emission measure tomography in combinationwith 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 hydrodynamicmodel, enthalpy-Based thermal evolution of loops (EBTEL). We compare the obtained results with the thermalproperties of coronal loops reconstructed with the DEMT-PFSS technique. Although we found similar tempera-ture distributions with DEMT and EBTEL, densities are a factor of two smaller for the EBTEL model. The causeof this apparent inconsistency is that the energy balance assumed in the tomographic procedure only considersthe coronal portion of the loop, while EBTEL also includes the role of the transition region.