Study of scaling laws in quietSun coronal loops

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

San Juan

Workshop; Towards Future Research on Space Weather Drivers; 2019

Different theoretical studies of active region (AR) plasmas provide relations between the physical parameters of 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 andKlimchuk 2000, ApJ, 530, 999). This task is specially difficult in the case of quiet-Sun loops, since they are not identifiable in observations. In a series of worksin recent years (see the review by Vasquez 2016, AdSpR, 57, 1286), a novel coronal tomography procedure was developed that provides, integrated from EUVobservations over a solar rotation, the three-dimensional distribution of the mean temperature and density in the coronal volume between 1.02 and 1.225solar radii. We study the Carrington rotation 2082, a solar rotation during the activity minimum between Solar Cycles 23 and 24. We use data from theExtreme Ultraviolet Image (EUVI) on board the Solar Terrestrial Relations Observatory (STEREO) spacecraft, to perform differential emission measuretomography (DEMT). We obtain loop-averaged electron density and temperature by tracing the DEMT products along the magnetic field lines obtained witha potential-field source-surface (PFSS) extrapolation of a synoptic magnetogram. Also, loop-integrated energy-related quantities are computed for eachclosed magnetic field line. In this work, we study the relation between observed and inferred parameters of quiet-Sun coronal loops to obtain scaling laws.