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Everything posted by GreatAttractor

  1. My results from Sunday (using Lunt 50 etalon; all stacked in AS!3 and processed with ImPPG). Note: you can enable animation looping; right-click them and chose "Loop". 90 mm refractor, Chameleon 3 (ICX445), poor seeing: A small surge (?) (30-second intervals, 0:30 h total): sek90.mp4 Off-band (with a slightly detuned etalon); I like how everything seems to be more lively (30-second intervals, 0:24 h total): sek90_off.mp4 In the morning, when the seeing was better, I was using the RC8 setup. The results are better than last time, but I don't know yet what helped the most: better seeing overall, for longer periods (didn't have the SSM with me) more frames to stack thanks to a faster camera replacing the Lunt's dyed-glass mini-ERF with Baader 35 nm Hα filter (as suggested by @Kitsunegari, thanks!); maybe I was indeed having thermal issues before I shot two animations, with the Chameleon (35 fps) and the Blackfly S (IMX273, 90 fps). The first yielded just a few good stacks (but that could be due to variable seeing), e.g.: The best stacks of the second animation were similar or slightly better: And the animation (nothing of note happened, unfortunately); 20-second intervals, 0:55 h total: sek200.mp4 Slightly more aggresive processing:
  2. Very nice results! But 10 000 frames (100 s) sounds a bit too much time-wise; at this scale I'd expect the features to evolve noticeably. Can you try processing just 2000-3000 frames?
  3. Seeing on Saturday was medium to poor, but I managed to get a usable still out of the RC8/Lunt 50 setup: Alas, after the morning M-class flare (during my breakfast), not much happened in AR2822. Just the usual rising/falling of small spikes, and a small surge in the upper FOV (90 mm aperture, 30-second intervals, 1:49 h total): anim.mp4
  4. No, of course, uploading to YT/Vimeo etc. is usually pointless. They recompress the videos, which in case of solar degrades fine details dramatically. But here you can upload directly the video you compressed yourself.
  5. Nice catch! Can't remember seeing a floater like this before. Suggestion: you can upload animations on SGL (and other forums running on more modern engines) as MP4 videos, this can drastically reduce file sizes compared to GIF. E.g. my animation from the other thread was 174 MiB as a GIF, and < 10 MiB as a H264-encoded video. At a bitrate preserving all details. You can convert to videos e.g. with the free FFMPEG tool, using an invocation like this:
  6. All shot on Saturday with 90/660 mm achromat, PGR Chameleon 3 mono (ICX445), processed with Stackistry, ImPPG and GIMP. 90 mm Lunt50 mod: Encouraged by an M-class flare in AR2871 earlier this week, I dutifully captured data for a time lapse, alas, not much has happened. A minor C1.0-flare at 11:30 UTC and a B7.2 at 12:04 UTC, also a part of the upper filament lifted off at some point. 30-second intervals, 4:45 h total: anim_all.mp4 Mandatory full disc: Lunt B600 CaK module, PowerMate 2.5x: Early morning seeing was really good despite the short wavelength: cak_seeing.mp4
  7. Yesterday's results from the RC8/Aries ERF/Lunt 50 etalon setup (all shot with Chameleon 3 mono, ICX445). Seeing wasn't particularly good for this aperture, but I managed to capture a few stills and a short time lapse: Animation of AR 2859, 30-second intervals, 48 minutes total:
  8. It's beautiful. I really need to create an intermediary 5"-aperture setup for Hα.
  9. Very nicely done. Looks like you've nailed the etalon tuning, things are nicely uniform.
  10. What a catch! That would be a "surge", if I'm not mistaken.
  11. Fantastic! Especially the big flare.
  12. Try the "Other Media" button and choose "Insert image from URL".
  13. White light – Mak 180, Baader solar film ND 3.8, Solar Continuum filter, 4-minute intervals, 1:33 h total: Hα – GSO RC8, Aries ERF, Lunt 50 etalon (not the best quality from this setup yet, the seeing could be better):
  14. Great video indeed! It seems to be the case. It's happening mostly in front of the nose and engine nacelles, not so much at the leading edges of the wings (which by design let the air go around them). I found some plots of air's index of refraction depending on pressure here. As you can see, the change is a very small fraction, BUT apparently when imaging a tiny FOV, like we do with the Sun, it's sufficient.
  15. Excellent animation. About the rotation - I haven't seen anything like it either. Some pores circling each other, yes, but not a rotating developed spot. You might be interested in ImPPG's image alignment feature.
  16. Looks great! What program do you use for stacking?
  17. Based on NOAA Solar and Geophysical Event Reports. There's an archive here. My flare is this one: :Product: 20210509events.txt :Created: 2021 May 11 0357 UT :Date: 2021 05 09 # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Please send comments and suggestions to SWPC.Webmaster@noaa.gov # # Missing data: //// # Updated every 5 minutes. # Edited Events for 2021 May 09 # #Event Begin Max End Obs Q Type Loc/Frq Particulars Reg# #------------------------------------------------------------------------------- 930 + 1338 1358 1409 G16 5 XRA 1-8A C4.0 3.1E-03 2822 930 + 1351 1354 1356 SAG G RBR 1415 210 2822 930 + 1352 1359 1407 HOL 3 FLA N15E51 SF ERU 2822
  18. On Sunday the seeing was finally good enough to utilize my RC8 + LS50THa + Aried tri-band ERF setup. One of the best videos yielded this image of AR 2822: I continued recording for some time, even though the seeing was variable and a high thin cloud was passing. I saw a few bright points appear, but had no way of knowing it would be a nice C4.0-class flare, until I put together an animation (20-second intervals, 43 minutes total): Beside the "igniting grass", note how there's a brightening in the billowing "smoke", right before a thin stream gets sucked back in to the smaller sunspot. I'm really satisfied; even despite the so-so seeing this tiny thing looks very interesting. Can't wait for an M-class like the one I caught with 90 mm – it would fill the whole FOV with twisting and churning plasma! I also recorded a CaK animation (Lunt CaK module, 90 mm refractor, PowerMate 2.5x), much better seeing than during the previous attempt, with consistently good resulting frames, but nothing happened there at all: Mandatory full disc from Lunt 50: and prominences from the 90 mm refractor: Captured with PGR Chameleon3 mono (ICX445), processed with AviStack 2, Stackistry, ImPPG, GIMP.
  19. Nice catch! Just a side note, I've just checked a 400-kilobyte JPG (quality = 90) would be fine without any loss of image details, instead of a >10-megabyte TIF
  20. I know that people use the Windows build of ImPPG successfully on Mac via Wine. As for Linux, it's straightforward to build from sources (I develop and use it on Fedora) - let me know if you try and if there are any problems.
  21. I had a nice, sunny Sunday with good-to-average seeing. Best frames, showing active regions 2018 and 2020: Not much was happening in these ARs during this capture (30 s intervals, 1:32 h total): (I checked in the NOAA solar event list that there was actually a small B-class flare in one of the other ARs.) I started in the morning with the big prominence, it was calm enough back then (30 s intervals, 1:00 h total): ...but a few hours later (I think it was the same one - it appears this way in the GONG archive) it became a bit more lively (same speed, 1:04 h total): Active regions in white light (30 s intervals, 0:34 h): A bit disappointing, I was counting on more pore movement, like in this animation from a few years back. And finally — my first CaK animation (30 s intervals, 0:58 h total): Interesting little sparks in the lower sunspot, but according to NOAA there were no flares there at the time. Everything captured with PGR Chameleon 3 mono (ICX445), processed with Stackistry, AviStack 2, ImPPG & GIMP. Hα: 90/660 mm refractor + Lunt 50 etalon, Barlow 1.6x. CaK: 90/660 mm refractor + Lunt CaK B600 module, PowerMate 2.5x. WL: SW Mak 127, Baader Astrosolar ND 3.8 + Solar Continuum filter.
  22. A new version of ImPPG has been released. Home page: https://greatattractor.github.io/imppg/ Download from: https://github.com/GreatAttractor/imppg/releases/tag/v0.6.3 Enhancements: - Opening an image file by dragging and dropping onto the ImPPG window Bug fixes: - Crash when batch processing in CPU mode with deringing enabled
  23. That's an interesting paper. If I understand correctly, NAFE is a sort of histogram stretch, performed piecewise for each image fragment. The example in the paper's Figure 2 looks similar to your result - i.e., dark, low contrast areas are "super-charged", stretched locally to cover a much wider brightness range. Certainly useful for a detailed analysis of small structures, but by definition it won't look like the raw image. From the paper: Sounds like a great candidate for porting to GPU!
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