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.
I deployed the Sol’Ex and JSol’Ex gear I have. I observed these on 2025-04-13.
Strontium signal at 4215.5Å, Sr II. Processing and signal enhancement in JSol’Ex. Rather elusive, but there are prominences too.
2025-04-13, Sr II at 4215.5A
A few more spectroheliograms from „obscure-to-amateurs” lines. Signals are enhanced.
Neutral Helium, He I, at 5015.7Å
Neutral Nickel, Ni I, at 5017.57Å
Ionized Iron, Fe II, at 5018.45Å
and a contionuum from the nearby lines
