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Non-equilibrium helium ionization in an MHD simulation of the solar atmosphere
Thomas Peter Golding, Jorrit Leenaarts, Mats Carlsson
The ionization state of the gas in the dynamic solar chromosphere can depart strongly from the instantaneous statistical equilibrium commonly assumed in numerical modeling. We impr…
Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres
A. M. Amarsi, M. Asplund, R. Collet +1
The OI 777 nm lines are among the most commonly used diagnostics for the oxygen abundances in the atmospheres of FGK-type stars. However, they form in conditions that are far from…
A publicly available simulation of an enhanced network region of the Sun
Mats Carlsson, Viggo H. Hansteen, Boris V. Gudiksen +2
Context. The solar chromosphere is the interface between the solar surface and the solar corona. Modelling of this region is difficult because it represents the transition from opt…
The Formation of IRIS Diagnostics. VII. The Formation of the OI 135.56 nm Line in the Solar Atmosphere
Hsiao-Hsuan Lin, Mats Carlsson
The O I 135.56 nm line is covered by NASA's Interface Region Imaging Spectrograph (IRIS) small explorer mission which studies how the solar atmosphere is energized. We here study t…
What do iris observations of Mg II k tell us about the solar plage chromosphere?
Mats Carlsson, Jorrit Leenaarts, Bart De Pontieu
We analyze observations from the Interface Region Imaging Spectrograph of the Mg II k line, the Mg II UV subordinate lines, and the O I 135.6 nm line to better understand the solar…
The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral line formation calculations
A. M. Amarsi, M. Asplund, R. Collet +1
We revisit the Galactic chemical evolution of oxygen, addressing the systematic errors inherent in classical determinations of the oxygen abundance that arise from the use of one d…