Search found 23 matches

by stefanoaz
Wed Jul 10, 2024 11:39 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Sun from 7th July 2024 and problem with scans
Replies: 6
Views: 647

Re: Sun from 7th July 2024 and problem with scans

Jan: For your FireCapture intermittency and stuttering, there are a few things to check. One prime suspect for the issue you're seeing, is the RAM buffer setting. This should be turned on - almost always - otherwise there will be data bottlenecks. Also, your "Heap size" setting should be a...
by stefanoaz
Wed Jul 10, 2024 11:28 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Sun from 7th July 2024 and problem with scans
Replies: 6
Views: 647

Re: Sun from 7th July 2024 and problem with scans

Hi Jan: You can change the FPS max limit setting in Firecapture - this is contained in the Firecapture.ini file that holds various settings and defaults that Firecapture reads when it starts up. The location of the file varies with the operating system, for the Mac it's located in ~/Library/FireCapt...
by stefanoaz
Sun Jun 16, 2024 6:57 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Surprising result from Ca-K image stacking (6 frames)
Replies: 3
Views: 299

Re: Surprising result from Ca-K image stacking (6 frames)

This morning I collected CaK stacks in Bin-1 mode instead of Bin-2 - camera is a QHY678M with 2µm pixels. When I stacked 6-7 frames out of 11 with this setup, I got the expected modest sharpening of the supercells and plages, and nothing like the spaghetti/bacilli of yesterday's Bin-2 frame stacking...
by stefanoaz
Sun Jun 16, 2024 1:33 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Surprising result from Ca-K image stacking (6 frames)
Replies: 3
Views: 299

Re: Surprising result from Ca-K image stacking (6 frames)

I just tried using a different deconvolution algorithm (Richardson-Lucy versus Van Cittert), and the result was very similar. Instead of seeing the supercells and blotchy plages, I'm see a finer structure which underlies both the cells and the plages, and the supercells are less obvious. This effect...
by stefanoaz
Sat Jun 15, 2024 11:16 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Surprising result from Ca-K image stacking (6 frames)
Replies: 3
Views: 299

Surprising result from Ca-K image stacking (6 frames)

Hi All: For the past couple of days I've been trying out image stacking on the SolEx SHG. I've done it with planetary images - was able to reach 2*Dawes limit. But the sun is dynamic and scan time limits the number of available frames. For the Sun I'm able to use 20x Sidereal slew for a scan time of...
by stefanoaz
Thu Jun 06, 2024 8:20 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: AR3697 strikes again, M6 flare at 1500UT
Replies: 1
Views: 204

AR3697 strikes again, M6 flare at 1500UT

I got lucky again and caught a flare right at 8Am local time, 1500 UTC. The first photo is at 14:00, and the second is at 15:01 UTC. The flares definitely are seen more localized and detailed in the pre-CLAHE processing, since they're so brilliant. Steve Before flare, H-alpha Sun_070011_20240606_dis...
by stefanoaz
Mon Jun 03, 2024 5:34 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Effect of aperture mask on Calcium-K/H images
Replies: 3
Views: 336

Re: Effect of aperture mask on Calcium-K/H images

Douglas: Do you use the stop at all wavelengths, or just at the Calcium lines? Steve Most optics work better at the wavelength near f/9 or f/10. I generally use 72mm with a 720mm focal length and 67mm at 600mm focal length. The focal ratio of the telescope should be what limits the focal ratio of th...
by stefanoaz
Sat Jun 01, 2024 11:06 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Effect of aperture mask on Calcium-K/H images
Replies: 3
Views: 336

Effect of aperture mask on Calcium-K/H images

Hi All: I noticed a while back that D. Smith has commented that he stops his refractor aperture down to (I think) 50mm when he takes images in the near-UV Calcium lines. I tried that this morning with my Evostar 72ED, using white card stock with a 50mm hole. It produces a noticeable sharpening and i...
by stefanoaz
Wed May 29, 2024 7:14 pm
Forum: SPoD Archive
Topic: X1.4 flare at 1430 UTC from AR3697
Replies: 3
Views: 430

X1.4 flare at 1430 UTC from AR3697

Hi All: The old AR3664 that was 15 earths wide, has come back around as AR3697. While the spot group doesn't appear to be as big as before, it's already thrown out two X-class flares. I got lucky this morning. I go out early while it's still cool outside (in Phoenix). I start in H-alpha, and about a...
by stefanoaz
Wed May 29, 2024 7:14 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: X1.4 flare at 1430 UTC from AR3697
Replies: 2
Views: 385

X1.4 flare at 1430 UTC from AR3697

Hi All: The old AR3664 that was 15 earths wide, has come back around as AR3697. While the spot group doesn't appear to be as big as before, it's already thrown out two X-class flares. I got lucky this morning. I go out early while it's still cool outside (in Phoenix). I start in H-alpha, and about a...
by stefanoaz
Wed May 29, 2024 2:16 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coronal Hole detection using the He d3 line as a proxy
Replies: 1
Views: 261

Coronal Hole detection using the He d3 line as a proxy

Hi All: This morning I took some Solex scans including at the He d3 line of 5867 Å. You can see the emission around the limb - that layer is about 1000km thick. But I was interested in something else. Years ago before EUV, images were taken at the strong Helium line at 10830Å, to detect the areas wh...
by stefanoaz
Tue May 28, 2024 11:02 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: maybe a new flare tonight? May 27th , @ 18h20 UT Paris
Replies: 5
Views: 433

Re: maybe a new flare tonight? May 27th , @ 18h20 UT Paris

I caught it in Arizona with the SolEx yesterday morning at 17:30 UTC. This morning a couple of spots from the group were beginning to appear.

Steve
Yesterday morning from AR3664
Yesterday morning from AR3664
Sun_070719_20240527_protus_0_00.jpg (400.89 KiB) Viewed 355 times
New AR from old AR3664, this morning 28/5
New AR from old AR3664, this morning 28/5
Sun_070258_20240528_autostretch_15_00.jpg (447.68 KiB) Viewed 355 times
by stefanoaz
Sun May 26, 2024 2:40 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG software spectral line curve-fit fails often
Replies: 5
Views: 657

Re: SHG software spectral line curve-fit fails often

I found that the exposure/gain of my SER videos was a bit low - this is particularly a problem in 16-bit mode. Also - I'm using my color planetary camera for this - the ASI178MC, in bin-2-monochrome mode. There is loss from the Bayer matrix filters that I would not have with a monochrome camera. Tod...
by stefanoaz
Fri May 24, 2024 3:35 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New SolEx user first photos
Replies: 3
Views: 627

Re: New SolEx user first photos

Absolutely fabulous!! :bow :hamster: Alexandra Thanks Alexandra :cool: Have you taken some photos? I think my favorite piece of gear is the new AM5 mount - it's portable and easy to set up. A tad pricey, but it will be the only mount I'll ever need. Completely different experience from the old CG5 ...
by stefanoaz
Fri May 24, 2024 2:53 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New SolEx user first photos
Replies: 3
Views: 627

New SolEx user first photos

These are my first photos with proper equipment, after I made some tests with a guide scope to help me see how much I would have to upgrade the mount and optics. I tried best practices to prepare the SolEx: I focused the SolEx camera train on a star and locked it, and then made the collimator adjust...
by stefanoaz
Wed May 22, 2024 5:40 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG software spectral line curve-fit fails often
Replies: 5
Views: 657

Re: SHG software spectral line curve-fit fails often

Here is an example of an unprocessed image set produced by D. Smith's SHG, which succeeded in his, but fails in INTI and JSolex:
Sun_110717_shift=10_ellipse_fit.png
Sun_110717_shift=10_ellipse_fit.png (479.01 KiB) Viewed 607 times
Sun_110717_spectral_line_data.png
Sun_110717_spectral_line_data.png (485.02 KiB) Viewed 607 times
by stefanoaz
Wed May 22, 2024 5:32 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG software spectral line curve-fit fails often
Replies: 5
Views: 657

Re: SHG software spectral line curve-fit fails often

One big correction to my original thread. D. Smith's SHG actually did not fail on a single one of the scans in question - so he seems to have solved a software issue that some SER files experience with the original INTI curve detect/fit, and the routine in JSolex. One thing about my SER images for t...
by stefanoaz
Wed May 22, 2024 1:23 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG software spectral line curve-fit fails often
Replies: 5
Views: 657

SHG software spectral line curve-fit fails often

Hi All: I'm been using the SolEx for about a week. I'm getting good spectral lines and have gotten my focus technique down to where the mount slew jitter is the limiting factor (new mount and Evostar 72ED coming soon). Since my two good scopes are both SCT and not (presently) usable with the SolEx, ...
by stefanoaz
Fri May 10, 2024 3:31 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: SHG slits from China: chrome on borosilicate glass, 7 micron by 13mm
Replies: 16
Views: 2290

Re: SHG slits from China: chrome on borosilicate glass, 7 micron by 13mm

Douglas: Did you see significant transversalium artifacts in the raw image from this slit?
by stefanoaz
Wed May 08, 2024 1:05 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: H-alpha and Ca-H high-resolution SHG images from 7 May 2024
Replies: 4
Views: 757

Re: H-alpha and Ca-H high-resolution SHG images from 7 May 2024

Douglas: What is the benefit of stopping the aperture at Ca-H? Is the longer focal length beneficial at that wavelength?

Steve
by stefanoaz
Sat May 04, 2024 3:02 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Shelyak website down
Replies: 2
Views: 415

Re: Shelyak website down

Olivier just responded on the SolEx group site on groups.io, that there is a temporary DNS issue. So - good news.
by stefanoaz
Sat May 04, 2024 1:20 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Shelyak website down
Replies: 2
Views: 415

Shelyak website down

Hi All: It seems like the website for Shelyak optical components has been offline for two days. Today I tried sending an email to that domain and got this error: <*****.*****@shelyak.com>: Host or domain name not found. Name service error for name=shelyak.com type=A: Host not found So it seems that ...