Solar polarimetry in the K I D2 line : A novel possibility for a stratospheric balloon
Of the two solar lines, K I D1 and D2, almost all attention so far has been devoted to the D1 line, as D2 is severely affected by an O2 atmospheric band. This, however, makes the latter appealing for balloon and space observations from above (most of) the Earth's atmosphere. We estimate the residual effect of the O2 band on the K I D2 line at
Quintero Noda, C. et al.
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2018