Search found 846 matches

by GreatAttractor
Tue Jul 05, 2022 4:13 pm
Forum: This is SolarChat !!
Topic: Granulation study with various filters (540-395 nm)
Replies: 11
Views: 180

Re: Granulation study with various filters (540-395 nm)

I have had a go with your images and find the continuum image gives the best granules but the 450nm-40nm image gives some lovely fine details around the spots and some interesting lines between the large spot groups to the single spot in the middle that's lost on the continuum image. Thanks! As for...
by GreatAttractor
Mon Jul 04, 2022 8:41 pm
Forum: This is SolarChat !!
Topic: Granulation study with various filters (540-395 nm)
Replies: 11
Views: 180

Re: Granulation study with various filters (540-395 nm)

Thanks, everyone.
Montana wrote: Mon Jul 04, 2022 9:06 am What a location Filip!! have you recently moved there?
It's great, and even has two ice-cold lakes (half-frozen until May) :) I moved a few months ago; I live about 90 minutes away now, so I'll be going there again for sure (also for planetary work later this year).
by GreatAttractor
Sun Jul 03, 2022 7:52 pm
Forum: This is SolarChat !!
Topic: Granulation study with various filters (540-395 nm)
Replies: 11
Views: 180

Re: Granulation study with various filters (540-395 nm)

If anyone's interested, here are the best raw stacks for each filter. Feel free to post your processing results, I'm curious to see what you can get out of it.
by GreatAttractor
Sun Jul 03, 2022 7:48 pm
Forum: This is SolarChat !!
Topic: Granulation study with various filters (540-395 nm)
Replies: 11
Views: 180

Granulation study with various filters (540-395 nm)

On Saturday I decided to see if Meteoblue's enticing seeing forecast (~0.6") for the Flüela Pass in the Alps (2384 m/7822 ft) is true, and drove there with all the gear. TL;DR: it was very good indeed. I was using the Intes M715 (180 mm f/15 RMCT) with Baader ND 3.8 solar film, Baader Solar Con...
by GreatAttractor
Sun Jul 03, 2022 1:49 pm
Forum: This is SolarChat !!
Topic: Timelapse 23 June 7-9am UT
Replies: 9
Views: 125

Re: Timelapse 23 June 7-9am UT

Great animation! I love how thick the "curtain" is.
by GreatAttractor
Sun Jul 03, 2022 10:10 am
Forum: SPoD Archive
Topic: AR 3038 in WL + granulation time lapse
Replies: 18
Views: 182

Re: AR 3038 in WL + granulation time lapse

but i have a cheap solar film ND5.0, can this be ok? Will work under certain conditions, see this post . What conditions? How to know? Just what's mentioned in the post: 1) don't use very big F-numbers (i.e., don't Barlow too much) 2) don't use very narrowband filters (e.g., Solar Continuum) The go...
by GreatAttractor
Sat Jul 02, 2022 3:15 pm
Forum: SPoD Archive
Topic: AR 3038 in WL + granulation time lapse
Replies: 18
Views: 182

Re: AR 3038 in WL + granulation time lapse

TareqPhoto wrote: Fri Jul 01, 2022 10:17 pm but i have a cheap solar film ND5.0, can this be ok?
Will work under certain conditions, see this post.
by GreatAttractor
Wed Jun 29, 2022 8:50 pm
Forum: Solar Software
Topic: Software for understanding the design of solar telescopes
Replies: 4
Views: 149

Re: Software for understanding the design of solar telescopes

Nice work!

Some of the tables pasted into and plotted in LibreOffice Calc (X axis = "xpos"):

3. collimated 50% air-spaced etalon using collimating lens on an f/7 scope
plot3.png
plot3.png (33.24 KiB) Viewed 90 times
6. air-spaced etalon on f/30 scope
plot6.png
plot6.png (24.71 KiB) Viewed 90 times
by GreatAttractor
Mon Jun 27, 2022 7:03 pm
Forum: This is SolarChat !!
Topic: AR 3038 in WL + granulation time lapse
Replies: 10
Views: 178

Re: AR 3038 in WL + granulation time lapse

Thank you, everyone. That Intes seems to be working very well Indeed! For now (at 540 nm) it's on par with my old SW Mak 180, but since it's a Rutten-MC, I'm hoping for equally good results - and higher resolution - at near UV (judging by this analysis by Christian). I've already got a few broadband...
by GreatAttractor
Sat Jun 25, 2022 8:57 pm
Forum: SPoD Archive
Topic: AR 3038 in WL + granulation time lapse
Replies: 18
Views: 182

AR 3038 in WL + granulation time lapse

The seeing on Thursday was mediocre, but my 3-hour session yielded a few good stacks. All taken with Intes M715, Baader ND 3.8 solar film + Solar Continuum filter, Blackfly S (IMX 273), processed with AS!3 and ImPPG. ar_3038.png High-cadence granulation time lapse (my first; the old ones from 2012 u...
by GreatAttractor
Sat Jun 25, 2022 8:57 pm
Forum: This is SolarChat !!
Topic: AR 3038 in WL + granulation time lapse
Replies: 10
Views: 178

AR 3038 in WL + granulation time lapse

The seeing on Thursday was mediocre, but my 3-hour session yielded a few good stacks. All taken with Intes M715, Baader ND 3.8 solar film + Solar Continuum filter, Blackfly S (IMX 273), processed with AS!3 and ImPPG. ar_3038.png High-cadence granulation time lapse (my first; the old ones from 2012 u...
by GreatAttractor
Thu Jun 23, 2022 7:40 pm
Forum: This is SolarChat !!
Topic: Huge filament at solar limb and AR13038 in Ha (RCT)
Replies: 17
Views: 295

Re: Huge filament at solar limb and AR13038 in Ha (RCT)

Great work. That filaprom shot is insane.
by GreatAttractor
Sun Jun 19, 2022 9:47 pm
Forum: This is SolarChat !!
Topic: Today's active regions in WL (Intes M715 first light)
Replies: 9
Views: 117

Re: Today's active regions in WL (Intes M715 first light)

So far I also have got the best results broad band results with a 180 mm f15 mak from skywatcher. Oh, I don't doubt it - I absolutely loved my "golden tube" SW Mak 180, which I had between 2012-2014 (esp. for the Sun and Jupiter, like here https://astrob.in/23109/0/). I decided to get ano...
by GreatAttractor
Sun Jun 19, 2022 8:00 pm
Forum: This is SolarChat !!
Topic: Today's active regions in WL (Intes M715 first light)
Replies: 9
Views: 117

Today's active regions in WL (Intes M715 first light)

Unpleasantly hot today, but I managed to test my new Intes M715 (180 mm f/15 Rutten-Maksutov-Cassegrain). I haven't checked the collimation yet, might need some tweaking. The seeing was unfortunately too unstable for an animation: ar_3038.png ar_3030_3032.png Blackfly S (IMX 273), Baader ND 3.8 sola...
by GreatAttractor
Wed Jun 15, 2022 7:55 pm
Forum: This is SolarChat !!
Topic: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha
Replies: 22
Views: 318

Re: April 18 flare, and May 10 giant prominence, C8 EDgeHD - double-stack Ha

Cracking images!

Yeah, it was an M class, I managed an animation (see this thread).
by GreatAttractor
Wed Jun 15, 2022 7:44 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Baader ND3.8 1m roll expression of interest - Update
Replies: 42
Views: 1977

Re: Baader ND3.8 1m roll expression of interest - Update

One can use ND 5, but it becomes suboptimal when you push the setup towards optimal sampling and contrast. E.g., at f/16 and with Solar Continuum (which is quite narrow at 8 nm), ND 3.8 led to about 7 ms exposure (at zero gain, with histogram at 80-90%) with the ICX445 sensor (newer ones might be be...
by GreatAttractor
Sun Jun 12, 2022 8:07 am
Forum: This is SolarChat !!
Topic: Prom: ASI174MM, prom quark & SW Evostar 80
Replies: 33
Views: 608

Re: Prom: ASI174MM, prom quark & SW Evostar 80

That's a great image.

In the not-too-distant future you should be able to use a Mac-native version of ImPPG, thanks to a contributor who's working on ironing out some compilation kinks.
by GreatAttractor
Thu Jun 09, 2022 6:52 pm
Forum: Solar Software
Topic: Convolution / Wavelets
Replies: 8
Views: 464

Re: Convolution / Wavelets

Thanks, that's a very cool video. As to the "how" of L-R deconvolution in particular, I didn't ponder it too much - just read the Wikipedia article , and implemented the described operations. It has been shown empirically that if this iteration converges, it converges to the maximum likeli...
by GreatAttractor
Wed Jun 08, 2022 6:17 pm
Forum: Solar Software
Topic: Convolution / Wavelets
Replies: 8
Views: 464

Re: Convolution / Wavelets

I can speak to what ImPPG does: non-blind Lucy-Richardson deconvolution with a Gaussian kernel. It assumes that the original, sharp image (as would be seen by your telescope placed just outside Earth's atmosphere) has been effectively¹ convolved with a Gaussian kernel. As if someone just applied &qu...
by GreatAttractor
Tue Jun 07, 2022 6:24 am
Forum: Solar Scope Modifications
Topic: New solar project 80mm
Replies: 6
Views: 322

Re: New solar project 80mm

Nice work! What do you use for collimation/refocusing, singlets or doublets?
by GreatAttractor
Wed Jun 01, 2022 7:36 pm
Forum: This is SolarChat !!
Topic: animation of June 1, 2022
Replies: 13
Views: 274

Re: animation of June 1, 2022

Beautiful animation.

What time intervals did you use?
by GreatAttractor
Mon May 23, 2022 5:58 pm
Forum: Solar Scope Modifications
Topic: iStar Optical for Solar
Replies: 32
Views: 1067

Re: iStar Optical for Solar

@Pablito had been using a 150 mm f/10.
by GreatAttractor
Sun May 22, 2022 6:30 pm
Forum: This is SolarChat !!
Topic: Twisting loops, M- and C-class flares
Replies: 17
Views: 292

Re: Twisting loops, M- and C-class flares

Thank you, everyone.

I'm thinking more and more about getting that intermediate 120-mm class setup for Hα and CaK.
by GreatAttractor
Sun May 22, 2022 9:33 am
Forum: This is SolarChat !!
Topic: 87 minute time-lapse of AR3014, 3015 and 3017 captured in H-Alpha 17th of May 2022
Replies: 12
Views: 233

Re: 87 minute time-lapse of AR3014, 3015 and 3017 captured in H-Alpha 17th of May 2022

Even a modest flare could power humanities global needs for many millennia, perhaps far longer. Hundreds of thousands of years or more. Good point, but for millennia - only a really powerful one. Per Wikipedia , typical energy release is 10²⁰ J, up to 10²⁵ for major events. Humanity's annual energy...
by GreatAttractor
Sat May 21, 2022 3:43 pm
Forum: This is SolarChat !!
Topic: 8 hours of video May 17
Replies: 15
Views: 275

Re: 8 hours of video May 17

Great video; I love the "ignited gasoline puddle" flare. Consider making MP4/H264 videos instead of GIFs. Unlike video hosting sites (Vimeo, YT), which re-encode what you upload and in our (solar) case ruin fine details, by encoding yourself you can fully preserve quality by fine-tuning th...