On 2025-06-16, at around 0936Z there was a bright flare visible in both Na D1 and Na D2, but also in He I D3 as a bright flash. 27 scans were recorded between 0856Z and 0940Z, with the last couple having the flare. The presented disk image is a composition of stacks, one stack of the disk without the flare, and another stack that shows the flare (motion blurred over a few minutes). Curious dopplers are also present in the raw, as sample frames from the raw scan show.
A stack of 40 scans obtained with ML Astro’s SHG 700 spectroheliograph.
A stack of 16 scans obtained with ML Astro’s SHG 700 spectroheliograph.
Ever tried posting a link under a youtube video? It may get auto-deleted, no matter if it is on topic. Tried talking about how to find the on-topic resource, to avoid deletion? Also gets deleted. What we get instead is AI-slop upon AI-slop and a control of the narrative, like those not really on youtube never even existed.
Just fuck that.
Google is not your friend.
I recorded 30 scans of the Sun, using the SHG 700 with a 678MM camera.
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).
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.
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…)
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/
Sol’Ex, JSol’Ex, stacks of 28 individual spectroheliograms
Sol’Ex, JSol’Ex, stack of six scans
