I used my solex setup to image the singly ionized iron right next to the forbidden oxygen. The signal is strong there. I cleaned up the image to remove most of the artefacts. Stack of 17 scans. 2025-04-21.
The Red Barium Sun
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…)
The Solar Disks Spectrum Atlas
From some of the data I recorded, among which there are quite a few comparatively wide cubes, I assembled the Atlas and published the software platform and the first cubes in it.
And the research note on the atlas: https://iopscience.iop.org/article/10.3847/2515-5172/adef50
Stuff I found on the net about this:
https://solarchatforum.com/viewtopic.php?t=50095
https://solarchatforum.com/viewtopic.php?p=476026
https://www.cloudynights.com/forums/topic/970675-first-ever-browsable-solar-spectrum-atlas/
Iron Sun, Fe II at 5018.45Å, on 2025-05-02
Sol’Ex, JSol’Ex, stacks of 28 individual spectroheliograms
The Sun at 4549.6Å, in Fe II and Ti II on 2025-05-02
Sol’Ex, JSol’Ex, stack of six scans
Strontium-Sun, Sr II at 4077.7Å
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.
More Metal on the Sun
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
Metal Sun, on 2025-04-05
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
The Iron Sun, Fe II 5018.45A, 2025-03-23
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
The Iron Sun, Fe II 501.548nm, 2025-03-22
A stack of 34 scans, with the Sol’Ex setup, going into the ionized iron at 5018.45A wavelength.
