Having laid the groundwork, here’s a stack of 18 individual spectroheliograms, with artefacts edited out, showing the iron signal.
Sol’Ex, JSol’Ex, Altair Astro Tri-RGB as full aperture ERF, 62/400 scope, EQ3 with rebuilt control, and solar autoguider.
I also included a He I D3, CaK and Ha image from the same session, two scans because of the incoming clouds.
iron, false color
iron, mono
different wavelengths
He I D3
Ca K
Hydrogen Alpha
