How cool is this. I imaged the Barium ion (BaII D2) line at 4554A. I did not expect anything, but it did, with some structure over the entire sun's disk. I seached more in the literature and found that the line is representing the low chromosphere, the same as the MgIb2 line. Thus I imaged the MgIb2 line and compared with the BaII line. Observation: more details in the sunspot, structure is same between Ba and Mg. Interesting is that Ba structure is dark, while the one for Mg is lighter.
According to Olshevsky et al. (2008) and Sütterlin et al.
(2001), the core of this line forms at about 700km.
Via a FB post I got feedback from Varadi Nagy Pal on more metal elements which show structure and even faint prominences. For more information see his blog
https://csillagtura.ro/He mentiones Fe, Ni, Sr of which Sol'Ex images are made. I will try to locate them using JSolex Spectrum analyzer.
