Ti I lines at 2.2 ${\mu}$m as probes of the cool parts of sunspots

@inproceedings{Smitha2021TiIL,
  title={Ti I lines at 2.2 \$\{\mu\}\$m as probes of the cool parts of sunspots},
  author={H. N. Smitha and J. S. Castellanos Dur'an and Sami K. Solanki and S. K. Tiwari},
  year={2021}
}
Context. The sunspot umbra harbors the coolest plasma on the solar surface due to the presence of strong magnetic fields. The routinely used atomic lines to observe the photosphere have weak signals in the umbra and are often swamped by molecular lines. This makes it harder to infer the properties of the umbra, especially in the darkest regions. Aims. The lines of the Ti i multiplet at 2.2 μm are formed mainly at temperatures ≤ 4500 K and are not known to be affected by molecular blends in… 

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