Three dimensional reconstruction and temporal evolution of plasma parameters along AR loops

NUEVO, F.A.; VÁSQUEZ, A.M.; MANDRINI, C.H.; LÓPEZ FUENTES, M.C.

Conferencia; XI Conferencia Latinoamericana de Geofísica Espacial (XI COLAGE); 2018

Due to theircharacteristic temperature and density, some magnetic flux tubes in activeregions (ARs) can be directly seen as bright structures in extreme ultraviolet(EUV) and soft X-ray images. For these structures a background subtractionmethod can be applied to isolate the intensity of the loop from that of thebackground. Background subtraction allows the observational determination ofplasma parameters (electronic density and temperature) along the loop using adifferential emission measure (DEM) technique analysis that can be applied toEUV images. The 3D structure of the magnetic field that corresponds to theobserved EUV loops is modeled using linear force-free field (LFFF)extrapolations that use AR magnetograms obtained with the Helioseismic andMagnetic Imager (HMI) instrument. In this work we reconstruct thethree-dimensional (3D) distribution of plasma parameters for an ensemble of EUVloops identified in images obtained with the Atmospheric Imaging Assembly (AIA)onboard the Solar Dynamics Observatory (SDO). The temporal evolution of theseparameters is studied while the loop is observable in AIA images. The studiedloops are approximately isothermal and overdense, consistent with previous studiesof loops observed in the EUV range with another instruments. We discuss ourresults in the context of coronal heating models.