Novel framework for the three-dimensional NLTE inverse problem

@article{tpn2022NovelFF,
  title={Novel framework for the three-dimensional NLTE inverse problem},
  author={Jiř{\'i} {\vS}těp{\'a}n and Tanaus{\'u} del Pino Alem{\'a}n and Javier Trujillo Bueno},
  journal={Astronomy \& Astrophysics},
  year={2022}
}
The inversion of spectropolarimetric observations of the solar upper atmosphere is one of the most challenging goals in solar physics. If we account for all relevant ingredients of the spectral line formation process, such as the three-dimensional (3D) radiative transfer out of local thermodynamic equilibrium (NLTE), the task becomes extremely computationally expensive. Instead of generalizing 1D methods to 3D, we have developed a new approach to the inverse problem. In our meshfree method, we… 

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