Search found 794 matches

by p_zetner
Thu Jul 19, 2018 4:32 am
Forum: This is SolarChat !!
Topic: 17 July: Some H alpha and Ca K shots
Replies: 10
Views: 138

Re: 17 July: Some H alpha and Ca K shots

Thanks Matt and Rainer. Rainer: I’m glad you found the post helpful. Referring to your earlier post https://solarchatforum.com/viewtopic.php?f=10&t=24786&p=222771#p222771 , I can’t really answer questions about optimal spacings with commercial focal extenders like the Televue because their designs a...
by p_zetner
Wed Jul 18, 2018 3:49 pm
Forum: This is SolarChat !!
Topic: 15-07-2018 Daystar Quark very good seeing
Replies: 14
Views: 178

Re: 15-07-2018 Daystar Quark very good seeing

Wow, a superb image, Ewan.

Cheers, Peter.
by p_zetner
Wed Jul 18, 2018 3:48 pm
Forum: This is SolarChat !!
Topic: Sol from the 16th of July 2018.
Replies: 7
Views: 76

Re: Sol from the 16th of July 2018.

I'm always impressed with the images you extract through the haze!
Lovely shots, Eric.

Cheers, Peter.
by p_zetner
Wed Jul 18, 2018 3:46 pm
Forum: This is SolarChat !!
Topic: 17 July: Some H alpha and Ca K shots
Replies: 10
Views: 138

Re: 17 July: Some H alpha and Ca K shots

Thanks, everyone, for the comments! Eric: Here's a diagram of the optical layout. It started out as a telecentric design but filters are actually situated in a fairly well collimated beam. The positions of the Lunt B1800 and the Omega CaK are reversed in the actual device (don't think that matters o...
by p_zetner
Wed Jul 18, 2018 3:40 pm
Forum: This is SolarChat !!
Topic: AR from July 17
Replies: 8
Views: 97

Re: AR from July 17

Nice take on the AR, Lou.

What kind of deconvolution do you use?

Peter.
by p_zetner
Wed Jul 18, 2018 3:33 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20180717) mid-afternoon
Replies: 10
Views: 158

Re: Today's SUN (20180717) mid-afternoon

Lovely set (as usual!), Pedro.

Cheers, Peter.
by p_zetner
Wed Jul 18, 2018 3:31 pm
Forum: This is SolarChat !!
Topic: halpha sun of july 17th
Replies: 8
Views: 93

Re: halpha sun of july 17th

Very nice images.
(Please feel free to post the non-colourized versions! :) )

Cheers, Peter.
by p_zetner
Tue Jul 17, 2018 8:51 pm
Forum: This is SolarChat !!
Topic: 17 July: Some H alpha and Ca K shots
Replies: 10
Views: 138

17 July: Some H alpha and Ca K shots

Hello Everyone; Here are some shots of the AR as it nears the limb. H alpha shots taken with Istar 100mmf12 scope (3.9X telecentric, Daystar QPE 0.6A and reducers) and CaK shots taken with Stellarvue 115mmf7 and custom optics. Cheers, Peter. H alpha: Focal ratio ~f24 2018-07-17-091648_AS2_proc_crop....
by p_zetner
Tue Jul 17, 2018 5:16 pm
Forum: This is SolarChat !!
Topic: 15 July AR in CaK
Replies: 8
Views: 107

Re: 15 July AR in CaK

Thanks everyone. I have to admit that I’m a little concerned about deconvolution artifacts at this image scale. I definitely noticed them when deconvoluting using ImPPG. Widening the PSF to give me some noticeable visual effect leads to artifacts upon sharpening. I’m using ImagesPlus pretty confiden...
by p_zetner
Tue Jul 17, 2018 5:11 pm
Forum: This is SolarChat !!
Topic: Sol from the 14th of July 2018.
Replies: 8
Views: 102

Re: Sol from the 14th of July 2018.

Beautiful shots, Eric.
The Ca full disks crackle with detail! Along with the other FDs, I really enjoy the H alpha surface closeups.
Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 11:38 pm
Forum: This is SolarChat !!
Topic: Denoise
Replies: 11
Views: 197

Re: Denoise

Thanks for posting this, Alexandra. Bruce, thanks for the tip about the Neat Image product.
by p_zetner
Mon Jul 16, 2018 11:27 pm
Forum: This is SolarChat !!
Topic: Sun from Brazil - 15th July
Replies: 11
Views: 157

Re: Sun from Brazil - 15th July

Beautiful set of images, especially the grayscale!

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 11:15 pm
Forum: This is SolarChat !!
Topic: Mosiac of the active region 7/16
Replies: 7
Views: 105

Re: Mosiac of the active region 7/16

Very nicely done mosaic. A great idea at this image scale.

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 7:00 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 15 July Spectroheliograms
Replies: 4
Views: 112

Re: 15 July Spectroheliograms

Hi Stu.

Thanks. They come from irregularities in the slit linearity and dust in the slit, mostly the latter. Need to clean for next time!

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 6:44 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 15 July Spectroheliograms
Replies: 4
Views: 112

15 July Spectroheliograms

Hello Everyone. Managed to set up the spectroheliograph for its first outing of 2018. Windy conditions made the effort a bit challenging and you can see the effect in the H alpha image. My spectroheliograms in H and Ca are mostly processed. I might yet tweak the H alpha a little to remove some of th...
by p_zetner
Mon Jul 16, 2018 6:40 pm
Forum: This is SolarChat !!
Topic: July 8th - Ha Session
Replies: 7
Views: 59

Re: July 8th - Ha Session

I agree with the comments above, Brian. The proms are excellent and some nice detail on the limb as well.

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 6:38 pm
Forum: This is SolarChat !!
Topic: Sol 15-7-2018 Ha
Replies: 7
Views: 85

Re: Sol 15-7-2018 Ha

Very nice disks. Glad you've included my favourite composition: inverted disk with positive proms!

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 6:35 pm
Forum: This is SolarChat !!
Topic: 15 July AR in CaK
Replies: 8
Views: 107

15 July AR in CaK

Hi Everyone.

A quick close-up of the AR in Ca light with my Stellarvue 115mm f7 APO triplet. Just a quick imaging session with the refractor as I wanted to spend some time with my spectroheliograph!

Cheers, Peter.
AR CaK 2018-07-15-091040.png
AR CaK 2018-07-15-091040.png (1.39 MiB) Viewed 107 times
by p_zetner
Mon Jul 16, 2018 6:30 pm
Forum: This is SolarChat !!
Topic: AR from July 12
Replies: 9
Views: 148

Re: AR from July 12

Thanks very much, Alexandra. Still experimenting with processing!

Cheers, Peter.
by p_zetner
Mon Jul 16, 2018 6:26 pm
Forum: This is SolarChat !!
Topic: Solar granulation and Ha 15th July
Replies: 12
Views: 186

Re: Solar granulation and Ha 15th July

Love the granulation images. Looks like seeing was fighting against you for the H alpha.
Cheers, peter.
by p_zetner
Mon Jul 16, 2018 6:25 pm
Forum: This is SolarChat !!
Topic: 14th July Ha and CaK sun
Replies: 12
Views: 121

Re: 14th July Ha and CaK sun

Very nice shots, Stu. Beautiful surface and prom detail.

Cheers, Peter.
by p_zetner
Sat Jul 14, 2018 9:34 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Recent Digital SHG
Replies: 12
Views: 195

Re: Recent Digital SHG

Very nice imaging, especially using a telescope focal length of 1800mm. Your seeing conditions must have been relatively stable.
by p_zetner
Sat Jul 14, 2018 8:51 pm
Forum: This is SolarChat !!
Topic: AR from July 12
Replies: 9
Views: 148

Re: AR from July 12

Thank you for your comments, everyone. Eric: I hope you get the chance soon to try your 10" Mak. I look forward to seeing images from this instrument. Stu: I'm totally impressed by the granulation shots with your 250mm RCT. Hope you have some luck with H alpha. Mark: I flat-field the images involvin...
by p_zetner
Fri Jul 13, 2018 6:40 pm
Forum: This is SolarChat !!
Topic: AR from July 12
Replies: 9
Views: 148

Re: AR from July 12

Also, a very small AR near the W limb that seems to have disappeared.
I just discovered this as seeing started to seriously degrade so the imaging was pretty bad.
Cheers, Peter.
2018-07-12-085837_crop_frame.png
2018-07-12-085837_crop_frame.png (993.38 KiB) Viewed 142 times
by p_zetner
Fri Jul 13, 2018 5:04 pm
Forum: This is SolarChat !!
Topic: AR from July 12
Replies: 9
Views: 148

AR from July 12

Greetings Everyone. Some views of the current AR at two different image scales. (Please excuse the dust mote on the higher magnification image. I didn't flat-field this one and don't have access to Photoshop at the moment!) Cheers, Peter. 2018-07-12-083908_crop_frame.png 2018-07-12-083908_crop_frame...