Three-dimensional tomographic reconstruction and MHD modeling of the low Corona during the last three solar minima

LLOVERAS, DIEGO G.; VÁSQUEZ, ALBERTO M.; NUEVO FEDERICO A.; FRAZIN, RICHARD A. ; MANCHESTER IV, WARD B.; MAC CORMACK, CECILIA; SACHDEVA, NISHTHA; VAN DER HOST, BARTHOLOMEUS; LAMY, PHILIPPE

Ushuaia

Congreso; Space Weather Observations Throughout Latinoamerica: Filling the Southern Gaps; 2023

Facultad de Ciencias Astronómicas y Geofísicas - UNLP

Interest in predicting space weather is constantly pushes the advance of three-dimensional (3D) magnetohydrodynamic (MHD) models of the corona and solar wind, which in turn need to be validated with observational data. Solar rotational tomography (SRT) is currently the only observational technique capable of providing an empirical 3D description of the coronal thermodynamic structure on a global scale. We have systematically applied SRT to images provided by three generations of space telescopes to perform coronal tomographic reconstructions during the last three minima of solar activity (years 1996, 2008, 2019). During them, the large-scale organization of the corona-wind system is as simple as possible, revealing more clearly the differences between the closed (streamers) and open (coronal holes) structures, as well as between the fast and slow components of the solar wind. In particular, the last three minima are of particular interest since they belong to solar cycles during which the level of activity decreased systematically. Applied to images in multiple bands of the EUV range, the SRT allows to reconstruct the 3D distribution of the density and temperature of the corona in the range of heliocentric heights r