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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

Merry Christmas, Happy New Year and looking forward to a great solar cycle 25!

Welcome to Solar Chat! The best forum for Solar Astronomy
Moving forward from solar cycle 24 to 25

Search found 3375 matches

by Valery
Wed Apr 09, 2014 11:05 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Re: Lunt CaK module bandwide?

marktownley wrote:
Valery wrote:
If you stack 4 or 5 2nm filters the overall transmission will drop significantly?
Yes, this is imminent - transmission drop. But even with five staked filters there will be a plenty light to work with.

Probably it is better to make true CaK etalons, not an interference filters.
by Valery
Wed Apr 09, 2014 10:59 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Re: Lunt CaK module bandwide?

I realised Valery when I said to drop me an email the files I was talking about i'd already uploaded into one of the CaK threads on here, but incase you haven't found them here they are again :) Thank you, Mark! Very interesting and I am glad to know your present setup delivers directly comparable ...
by Valery
Wed Apr 09, 2014 7:59 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Re: Lunt CaK module bandwide?

Hi Mark and Valery very interesting discussion. We made tests on the combination K-Line double stack plus Bob1 and Bob2 stacked on to them. The result was not even reaching near the standard LUNT B1200 caK wedge. I guess the final filter has to have around 2-3 A FWHM to reveal fine CaK II details W...
by Valery
Wed Apr 09, 2014 4:02 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Re: Lunt CaK module bandwide?

Valery: You are having 2Ang+1/-0 Ang 3-4 cavity filters made? What size of bandpass CA are you making. That design should work out very well. These filters are not going to be cheap. That narrow I would assume they are going to be hard coated. That is a tough order to keep the spacing right. Also h...
by Valery
Tue Apr 08, 2014 2:59 pm
Forum: This is SolarChat !!
Topic: Nice prominence March 24 through 150mm scope.
Replies: 10
Views: 911

Re: Nice prominence March 24 through 150mm scope.

Thanks a lot, guys. I will keep you posted with new works if the weather will cooperates and my time permits.
by Valery
Tue Apr 08, 2014 2:56 pm
Forum: This is SolarChat !!
Topic: Large sun spot. 150mm scope.
Replies: 10
Views: 436

Re: Large sun spot. 150mm scope.

Thank you all, friends, for your kind words - they are very much valuable for me!
by Valery
Tue Apr 08, 2014 2:16 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Re: Lunt CaK module bandwide?

Thanks, Walter! Note that on your graph the Lunt stack has a notable asymmetrical shape and wide of 2,4nm - again, nanometers, not angstroms! Mark T. noted that the spectrometer you have used has only 1nm resolution. In this case if the Lunt stack has 0,24nm band wide, then this spectrometer can't r...
by Valery
Sun Apr 06, 2014 10:27 am
Forum: This is SolarChat !!
Topic: Lunt CaK module FWHM ?
Replies: 7
Views: 273

Re: Lunt CaK module FWHM ?

Hi Valery 2,4 A for the LUNT B1200 Thanks, Walter. Now I am really very much confused. In the "Solar telescope modifications" in the topic "A surprise in the LUNT CaK wedge" there is your scan of the Lunt stack (from the Lunt CaK module, wedge) http://solarchat.natca.net/viewtopic.php?f=9&t=5746 in...
by Valery
Sun Apr 06, 2014 3:44 am
Forum: This is SolarChat !!
Topic: Lunt CaK module FWHM ?
Replies: 7
Views: 273

Re: Lunt CaK module FWHM ?

This might help: http://www.stephenramsden.com/solarastrophotography/Observing%20in%20Ca%20II%20K.pdf Thank you, Joe. I already read this nice article. However the only indication about band wide I was able to find there is that PST CaK has 2,2A FWHM. However I need to know the FWHM and transmissio...
by Valery
Sun Apr 06, 2014 12:04 am
Forum: This is SolarChat !!
Topic: Lunt CaK module FWHM ?
Replies: 7
Views: 273

Lunt CaK module FWHM ?

Does anybody know what is the FWHM and transmission % of the Launt CaK modules?

Thanks,

Valery.
by Valery
Sat Apr 05, 2014 6:25 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Lunt CaK module bandwide?
Replies: 55
Views: 4148

Lunt CaK module bandwide?

Does anybody know what is the FWHM and transmission % of the Launt CaK modules?

Thanks,

Valery.
by Valery
Sat Apr 05, 2014 11:03 am
Forum: This is SolarChat !!
Topic: High resolution photos April 3, 2014. 150mm scope.
Replies: 14
Views: 850

Re: High resolution photos April 3, 2014. 150mm scope.

Great detail in these images Valery. I can find no information of your setup or your Aries solar kit. Could you share some details. This is a lit of optics (5 lenses, two parts of mechanics) which transforms any of three SkyWarcher telescopes 100mm F/5, 120mm F/5 or 150mm F/5 in to a solar H-a tele...
by Valery
Sat Apr 05, 2014 8:16 am
Forum: This is SolarChat !!
Topic: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?
Replies: 78
Views: 6869

Re: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?

Valery, As Mark requested earlier....do you have any photos of your set-up and details of your "ARIES" arrangement?? Before I will be ready to offer my kits for purchase I will not show any photos of the setup. The delay was due to improvement of the safety of the kits. I was promised that the coat...
by Valery
Fri Apr 04, 2014 9:01 pm
Forum: This is SolarChat !!
Topic: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?
Replies: 78
Views: 6869

Re: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?

Stephen, I am sure that Quark will hit the "market" of all possible PST mods. Really, it costs a bit more, but offer much larger blocker -12mm, etalon is of the same size - 20mm, but Quark etalon possibly is a temperature tuning (need to be confirmed) device - results no banding and much more even f...
by Valery
Fri Apr 04, 2014 12:07 pm
Forum: This is SolarChat !!
Topic: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?
Replies: 78
Views: 6869

Re: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?

In general, I think that all these PST mods have inspired DayStar to develop this Quark system.

I expect a noticeable prices drop for most of narrow band filters stuff.


Valery.
by Valery
Fri Apr 04, 2014 11:45 am
Forum: This is SolarChat !!
Topic: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?
Replies: 78
Views: 6869

Re: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?

Very important question.

From the DayStar webpage QUARK description: "Tuning knob allows wing shifting +/- 0.5Å with detents at every 0.1Å "

Is this tuning works by the etalon temperature change or just by the tilt of the etalon?


Regards,

Valery
by Valery
Fri Apr 04, 2014 11:13 am
Forum: This is SolarChat !!
Topic: Today's White Light Solar Images - 04 April
Replies: 13
Views: 258

Re: Today's White Light Solar Images - 04 March

Very nice, George!

BTW, Change the name of the thread. It is April 4, not March 4! :)
by Valery
Thu Apr 03, 2014 6:35 pm
Forum: This is SolarChat !!
Topic: High resolution photos April 3, 2014. 150mm scope.
Replies: 14
Views: 850

High resolution photos April 3, 2014. 150mm scope.

Today I managed to take some high resolution photos of the active regions on the Sun.
SW150/750 + Aries solar kit + LS50F Ha + Flea3 camera.

600 frames out of 1300. Seeing 3-4 out of 5.

Thanks for looking.

Valery.
by Valery
Wed Apr 02, 2014 4:47 am
Forum: This is SolarChat !!
Topic: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?
Replies: 78
Views: 6869

Re: Daystar: QUARK the first Hydrogen Alpha "Eyepiece" ?

This is all possible. I believe, that this is the answer for all these PST mods. It is easy to make a powerful tele centric Barlow and small Ha filter in one package.
If this a real device, then I predict the prices fall off for all these DS II modules, small front etalons etc.
by Valery
Mon Mar 31, 2014 12:10 am
Forum: This is SolarChat !!
Topic: March 26th Ha Session
Replies: 14
Views: 506

Re: March 26th Ha Session

Brian, what is the aperture of your 150mm scope now? As I understand it now limited by ERF filter size?

Valery.
by Valery
Sun Mar 30, 2014 6:45 am
Forum: This is SolarChat !!
Topic: Large sun spot. 150mm scope.
Replies: 10
Views: 436

Large sun spot. 150mm scope.

Here is a large group of the sun spots. Photo was taken March 24 2014 at 9h 03m UT through a SW150mm F/5 refractor equipped with Aries solar kit, LS50F etalon (B1200) and Flea3 1,3Mpz GigE mono camera. Here is a full size: http://www.astronomy.ru/forum/index.php?action=media;sa=media;in=5234 Thanks ...
by Valery
Sun Mar 30, 2014 6:15 am
Forum: This is SolarChat !!
Topic: Two photos of the same group 0.7A and 0.5A. 150mm scope.
Replies: 12
Views: 725

Re: Two photos of the same group 0.7A and 0.5A. 150mm scope.

Valery, beautiful details! Just a Photoshop suggestion, with such detail in the umbra in the .7 image, try masking in the umbra details from the .7 into the .5. This will get the best detail from both images. just a suggestion to make gorgeous images even better. Joe, I am not familiar with all the...
by Valery
Sat Mar 29, 2014 12:55 pm
Forum: This is SolarChat !!
Topic: Nice prominence March 24 through 150mm scope.
Replies: 10
Views: 911

Nice prominence March 24 through 150mm scope.

Nice prominence on a Suoth-East solor limb. March 24 2014 at 10-00 UT

SW150/750 + Aries solar kit + LS50F + PGR Flea3 mono.

Thanks for looking.

Valery.
by Valery
Sat Mar 29, 2014 11:20 am
Forum: This is SolarChat !!
Topic: Two photos of the same group 0.7A and 0.5A. 150mm scope.
Replies: 12
Views: 725

Re: Two photos of the same group 0.7A and 0.5A. 150mm scope.

marktownley wrote:An excellent pair of comparison images valery, always a pleasure to see your shots. Definitely remove the pre filters on these etalons, what ERF do you use - front end full aperture or a sub aperture ERF in the tube?
Thaks Mark, I do use subaperture D-ERF applied on the front collimation lens.