Ivan Milic
Institute for Solar Physics (KIS), Freiburg, Germany & Faculty of Mathematics, University of Belgrade, Serbia

Abstract
Probing the physical conditions in the solar atmosphere is essential for understanding the processes in the solar interior, fundamental magnetohydrodynamic phenomena in the atmosphere, and, finally modeling the boundary conditions for the space weather phenomena. Temperatures, plasma velocities, and magnetic fields cannot be measured directly but must be inferred from the shapes of the spectral lines in the solar spectra and their polarization. Thus, we must understand the interaction between the light and particles in the atmosphere of the Sun, and identify robust and sensitive observables that will allow us to probe physical quantities of interest. By looking at different spectral regions and using high spectral and spatial resolution spectropolarimetry we can reconstruct the structure of the solar atmosphere in three dimensions.
In this talk, we will discuss the theoretical basics of spectropolarimetric inversions - the most advanced methods for probing the solar atmosphere. We will discuss the state-of-the-art observational and computational trends and pay special attention to so-called end-to-end studies which are a way for us to scrutinize our inference process and identify biases in our results. Specifically, we will talk about the importance of high spatial resolution when probing the solar magnetic fields and pinpoint limited spatial resolution as one of the possible solutions to the so-called “Open flux problem”.

2024 June 28, 13:30

IA/U.Coimbra
Observatório Geofísico e Astronómico (Meetings room)
R. Observatório s/n, 3040-004 Coimbra