J. Trujillo Bueno

TL;DR: Three-dimensional radiative transfer modelling of scattering polarization in atomic and molecular lines that indicates the presence of hidden, mixed-polarity fields on subresolution scales finds a ubiquitous tangled magnetic field with an average strength of ∼130 G.

TL;DR: In this paper, the authors presented the results of an investigation of the quiet Sun's magnetic field based on high-resolution infrared spectropolarimetric observations obtained with the Tenerife Infrared Polarimeter (TIP) at the German VTT of the Observatorio del Teide.

TL;DR: In this paper, the authors present a computer program for the synthesis and inversion of Stokes profiles caused by the joint action of atomic level polarization and the Hanle and Zeeman effects in some spectral lines of diagnostic interest, such as those of the He I 10830 A and 5876 A multiplets.

TL;DR: NICOLE as mentioned in this paper is a non-LTE radiative transfer tool for the synthesis and inversion of spectral lines and Zeeman-induced polarization profiles from the photosphere to the chromosphere.

TL;DR: It is shown that the polarized light arises from selective absorption from the ground level of the triplet system of helium, and that the presence of magnetic fields of the order of a few gauss that are highly inclined with respect to the solar radius vector disproves the common belief that population imbalances in long-lived atomic levels are insignificant.