Solar polarimetry in the K I $D_2$ line: A novel possibility for a stratospheric balloon

C. Quintero Noda, G. L. Villanueva, Y. Katsukawa +9

Of the two solar lines, K I $D_1$ and $D_2$, almost all attention so far has been devoted to the $D_1$ line, as $D_2$ is severely affected by an O${}_2$ atmospheric band. This, howev…