Continuing my incursions into virtually (at least by amateurs) unexplored lines, on 2025-04-20 I went into the singly ionized Strontium at 407.77 nanometers (4077.7 Ångström).
Sol’Ex, JSol’Ex and imagemath scripts to dig out the weak signal.
And a trisolaran werk photo also, with the spectroheliograph’s three Suns.
continuum
raw disk of Sr II at 407.77nm
continuum vs line
Sun1 on the LCD, Sun2 on the sky and in the instrument, Sun3 in the projecting finder
