Search found 873 matches

by p_zetner
Mon Sep 17, 2018 1:55 am
Forum: This is SolarChat !!
Topic: Chromosphere September 16th
Replies: 11
Views: 227

Re: Chromosphere September 16th

Very nice images, Franco.
I guess we’re stuck with small ARs for a while!
Cheers.
Peter
by p_zetner
Sun Sep 16, 2018 9:00 pm
Forum: This is SolarChat !!
Topic: Prominence Hedgerow Animation
Replies: 10
Views: 205

Re: Prominence Hedgerow Animation

Beautiful animation!

Cheers.
Peter
by p_zetner
Sun Sep 16, 2018 6:19 pm
Forum: This is SolarChat !!
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 18
Views: 433

Re: Surface contrast in CaK for various filter bandpasses.

Thanks for your comments Eric, George and Mark. George, I really appreciate your feedback on this. I am planning to do a similar filter simulation for the H alpha sweep. A direct comparison of the CaK and H alpha simulations will, I'm sure, confirm what you have concluded in your comparison of the s...
by p_zetner
Sat Sep 15, 2018 4:32 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 502

Re: 08Aug: Spectral sweep through the Ca K line

Thanks, John.

As you can imagine, these animations require a lot of work (40 spectroheliograms in this case) but I enjoy the end result.

Cheers.
Peter
by p_zetner
Sat Sep 15, 2018 4:28 pm
Forum: This is SolarChat !!
Topic: September 13 in Ha
Replies: 10
Views: 211

Re: September 13 in Ha

Nice images, Brian.
You captured some pretty fine detail in those proms.

Cheers.
Peter
by p_zetner
Sat Sep 15, 2018 3:58 pm
Forum: This is SolarChat !!
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 18
Views: 433

Re: Surface contrast in CaK for various filter bandpasses.

Thanks for the comments everyone. One thing I wanted to note was that my simulated filter (spectral) transmission curve is Gaussian while an etalon filter (single stack) has a Lorentzian profile. The Lorentzian curve has broader shoulders ( https://solarchatforum.com/viewtopic.php?f=8&t=22830 ) so t...
by p_zetner
Fri Sep 14, 2018 8:14 pm
Forum: This is SolarChat !!
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 18
Views: 433

Surface contrast in CaK for various filter bandpasses.

Hello Everyone. I recently posted an animated spectral sweep through the CaK assembled from images taken with my spectroheliograph on Aug08. https://solarchatforum.com/viewtopic.php?f=8&t=25028 It brought up some interesting questions from Valery and Christian that I thought I'd look into. The basic...
by p_zetner
Fri Sep 14, 2018 1:54 pm
Forum: This is SolarChat !!
Topic: Tiny AR12721 in H-alpha and CaK: Sept10
Replies: 7
Views: 174

Re: Tiny AR12721 in H-alpha and CaK: Sept10

Thanks, Everyone.

Raf, I'm very pleased with the uv performance of this scope. It's time to adjust the optics and push the magnification a little bit!

Cheers.
Peter
by p_zetner
Thu Sep 13, 2018 10:09 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 502

Re: 08Aug: Spectral sweep through the Ca K line

Ken: Thanks for running the calculation. It seems to be in the ball park, although, I guess, it is a best estimate of resolution as, for example, optical aberrations aren't considered. It's pure laziness that I haven't made a bench test of the resolution recently. I'll do this in the near future. Va...
by p_zetner
Thu Sep 13, 2018 10:00 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: G2 Geomagnetic Storm 11th Sept 2018
Replies: 5
Views: 194

Re: G2 Geomagnetic Storm 11th Sept 2018

Nice recording, Stu.
It strikes me as odd and interesting that you're measuring this kind of activity with the quiet Sun. I would've thought there's more of a connection with magnetic activity.

Cheers.
Peter
by p_zetner
Thu Sep 13, 2018 9:19 pm
Forum: This is SolarChat !!
Topic: Tiny AR12721 in H-alpha and CaK: Sept10
Replies: 7
Views: 174

Tiny AR12721 in H-alpha and CaK: Sept10

Hi Everyone. Seeing was bad to mediocre and definitely affected the quality of the higher res h-alpha images here. The CaK didn't turn out too badly. The highest res h-alpha was 2x2 binned at capture (shorter exposure time allowed). Cheers. Peter 2018-09-10-090139-0000_proc1_crop_png-proc.png 2018-0...
by p_zetner
Thu Sep 13, 2018 9:15 pm
Forum: This is SolarChat !!
Topic: Proms and AR from Sept 12
Replies: 4
Views: 79

Re: Proms and AR from Sept 12

Nice shots, Lou.

Peter
by p_zetner
Thu Sep 13, 2018 9:14 pm
Forum: This is SolarChat !!
Topic: Today's Proms & AR2722 in HA & CaK | Sep 12th 2018
Replies: 6
Views: 116

Re: Today's Proms & AR2722 in HA & CaK | Sep 12th 2018

Another beautiful set, Marty.

Cheers.
Peter
by p_zetner
Thu Sep 13, 2018 9:13 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20180913) + granulations shots
Replies: 7
Views: 286

Re: Today's SUN (20180913) + granulations shots

Great disks and granulation, Pedro.

Cheers.
Peter
by p_zetner
Thu Sep 13, 2018 9:12 pm
Forum: This is SolarChat !!
Topic: Today's Crazy Prom Forest! Plus Active Regions in HA & CaK | Sept 13th 2018
Replies: 8
Views: 211

Re: Today's Crazy Prom Forest! Plus Active Regions in HA & CaK | Sept 13th 2018

Very nice images, Marty.
I especially enjoy the contrasty, b/w H-alpha.

Cheers.
Peter.
by p_zetner
Thu Sep 13, 2018 9:11 pm
Forum: This is SolarChat !!
Topic: Ca-H full disc of Sept. 13th
Replies: 6
Views: 132

Re: Ca-H full disc of Sept. 13th

Nice images, Raf.

I agree about ImPPG. I'm always worried it leaves small scale artifacts with CaK. I use ImagesPlus .. very slow but, I think, more reliable deconvolution.

Cheers.
Peter
by p_zetner
Thu Sep 13, 2018 9:09 pm
Forum: This is SolarChat !!
Topic: Protu 2018 9 11 +100.000 km
Replies: 9
Views: 179

Re: Protu 2018 9 11 +100.000 km

Beautiful shots.
Some great action in the AR. I think it was very short lived.

Peter.
by p_zetner
Sun Sep 09, 2018 8:19 pm
Forum: This is SolarChat !!
Topic: 5th September Proms
Replies: 6
Views: 131

5th September Proms

Greetings Everyone.

A proms shot from a few days ago. Mediocre seeing so focal reduction required on my C8 with 4.4x telecentric.
Hope to get a chance at the little AR and beautiful proms tomorrow.

Cheers, Peter.
2018-09-05-092254_Proms-disk_final_proc1_crop.png
2018-09-05-092254_Proms-disk_final_proc1_crop.png (826.56 KiB) Viewed 131 times
by p_zetner
Thu Aug 30, 2018 11:59 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 502

Re: 08Aug: Spectral sweep through the Ca K line

Thanks for all your comments, Everyone. Ken: I haven't bench tested this lately but can get a rough estimation from my H alpha results of this August. If I compare the fwhm of a measured spectral line in my instrument with a spectral linewidth of the same line in the BASS2000 spectrum, I get an inst...
by p_zetner
Thu Aug 30, 2018 10:25 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug Disk: Spectral sweep through H-alpha.
Replies: 7
Views: 226

Re: 08Aug Disk: Spectral sweep through H-alpha.

Thanks, Stu. I find the behaviour of the filaments, as you sweep through the line, interesting as well, especially the one lying halfway between disk centre and the E limb. A part of it seems to persist over a large portion of the sweep, suggesting a high temperature? I'm just finishing some analysi...
by p_zetner
Thu Aug 30, 2018 9:20 pm
Forum: This is SolarChat !!
Topic: Granulation shots (TEC140 F/7, X4 & X5 Powermates)
Replies: 16
Views: 367

Re: Granulation shots (TEC140 F/7, X4 & X5 Powermates)

A great compendium of granulation, Pedro!

Cheers, Peter.
by p_zetner
Thu Aug 30, 2018 9:12 pm
Forum: This is SolarChat !!
Topic: High Res Chromosphere at 393.4A | Aug 30th 2018
Replies: 12
Views: 296

Re: High Res Chromosphere at 393.4A | Aug 30th 2018

Nice images, Marty.
You did a good job capturing the CaK chromospheric texture without introducing any artifacts, as far as I can tell!

Cheers, Peter.
by p_zetner
Wed Aug 29, 2018 2:22 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: G3 solar storm- Magnetometer response 25th-26th Aug 2018_Updated
Replies: 10
Views: 213

Re: G3 solar storm- Magnetometer response 25th-26th Aug 2018_Updated

Great data recording, Stu. The match with Chambon la Foret is amazing.

Mark, your pictorial follow up is awesome. Seems like your trip is going well.

Cheers, Peter.
by p_zetner
Tue Aug 28, 2018 4:38 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 502

08Aug: Spectral sweep through the Ca K line

Hi Everyone. Here is an animated spectral sweep through the Ca K line from data taken during my 08Aug imaging session. The wavelength offsets (in milliAngstroms) are marked in the upper left hand corner of each frame. The frame rate is rather slow this time. I used one second per frame (36 frames) f...
by p_zetner
Mon Aug 27, 2018 8:05 pm
Forum: This is SolarChat !!
Topic: AR12720 in H alpha
Replies: 7
Views: 172

Re: AR12720 in H alpha

Thanks, Franco.

Like I replied above, the milky sky may have contributed to the soft look!

I do try not to overprocess but sometimes end up losing some detail. Still struggling with the processing workflow.

Cheers, Peter.