Using the ML Astro SHG 700 (third batch) spectroheliograph, on a 80/540 refractor, ASI 678MM camera, I recorded seven scans of the Sun, in the singly ionized iron line, Fe II 5018.45Å.

This is what I got after getting rid of the artefacts and amplifying a bit the already strong signal (way stronger than He I D3).

singly ionized Barium, Ba II at 6141.73Å

I scanned the Sun into a cube, containing the Ba II line at 6141.73Å which, like we’ve seen with ionized metals before, turn the active regions dark, instead of letting them shine against a darker photosphere. The atmosphere was remarkably calm on 2025-04-21, and further, the disks were anti-jagged by an experimental feature in JSolEx. (tovább…)

Sol’Ex, JSol’Ex, stack of six scans

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.

(tovább…)

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

(tovább…)