Coronal-heating scaling-laws derived using tomography

MAC CORMACK, C.; LLOVERAS, D.G.; LÓPEZ FUENTES, M.C.; VÁSQUEZ, A.M.; MANDRINI, C.H.

Antofagasta

Congreso; XVI Latin-American Regional IAU Meeting; 2019

Several studies provide different relations between the physical parameters of active region (AR) coronal loops, such as temperature, density, loop length and magnetic field. These relations predict particular scaling laws that can be compared with observations (see Mandrini, Demoulin and Klimchuk 2000, ApJ, 530, 999). In quiet-Sun loops, this task is specially difficult since they are not identifiable in observations. In previus works (see the review by Vasquez 2016, ASR, 57, 1286), a novel coronal tomography procedure was developed that provides the three-dimensional distribution of the mean temperature and density in the coronal volume between 1.02 and 1.225 solar radii from EUV time series images over a solar rotation. We study the Carrington rotation 2082, a solar rotation during the activity minimum between Solar Cycles 23 and 24. We use data from the Extreme Ultraviolet Imager (EUVI) on board the Solar Terrestrial Relations Observatory (STEREO) spacecraft, to perform a differential emission measure tomography (DEMT). We obtain loop-averaged electron density and temperature by tracing the DEMT results along the magnetic field lines obtained with a potential-field source-surface (PFSS) extrapolation of a synoptic magnetogram. We also computed loop-integrated energy-related quantities for each closed magnetic field line. In this work, we analyze the relation between observed and inferred parameters of quiet-Sun coronal loops to determine scaling laws.