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

MANDRINI, CRISTINA H.; NUEVO, FEDERICO A.; LÓPEZ FUENTES, MARCELO; ALBERTO M. VASQUEZ

Ciudad de Buenos Aires

Conferencia; COLAGE XI; 2018

ALAGE

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