High-precision spectral inversions: determining what is important for the accurate definition of incident radiation boundary conditions

HIGHLIGHTS

• What: As the authors show in Sect 4, the high-precision definition of the incident radiation depends on the combination of the actual velocity vector, the altitude, the presence of the centreto-limb variation in the illumination from the solar surface, and the shape of the illuminating spectral line profile. The authors focus on the velocity-sensitive spectral lines, such as Mg ii H and amp;K or Ca ii H and amp;K. To quantify the influence of the altitude on the definition of the incident radiation boundary conditions, the authors focused on altitudes above the . . .
  

   

  

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