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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.

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

Search found 514 matches

by krakatoa1883
Wed Dec 11, 2019 5:10 pm
Forum: This is SolarChat !!
Topic: Introduction and small question
Replies: 10
Views: 102

Re: Introduction and small question

Welcome on board. Try to obtain the best tuning on most of the disc by playing with the tuning knob only, then move the image on the sensor to make the brightness as even as possible, this should solve most of the problem. Consider that images may not be uniform even through pressure-tuned scopes al...
by krakatoa1883
Tue Oct 29, 2019 10:58 am
Forum: This is SolarChat !!
Topic: Plage Progression Through Cycle 24
Replies: 14
Views: 444

Re: Plage Progression Through Cycle 24

Fantastic work, Stu, much interesting indeed.
by krakatoa1883
Tue Oct 29, 2019 10:53 am
Forum: This is SolarChat !!
Topic: Sol from the 28th of October 2019.
Replies: 5
Views: 224

Re: Sol from the 28th of October 2019.

Beautiful discs, Eric!
by krakatoa1883
Tue Oct 29, 2019 10:47 am
Forum: This is SolarChat !!
Topic: Few images of October 27th
Replies: 14
Views: 401

Re: Few images of October 27th

Thanks for your comments. Confirm, is the LS50 as it exactly fits in the M68 female thread on the focuser tube. A Baader D-ERF is in front of the objective.
by krakatoa1883
Mon Oct 28, 2019 7:12 pm
Forum: This is SolarChat !!
Topic: Few images of October 27th
Replies: 14
Views: 401

Re: Few images of October 27th

Thanks Alexandra & Maurits. Here are the rear filters I used
luntmodquark.jpg
luntmodquark.jpg (87.67 KiB) Viewed 322 times
by krakatoa1883
Mon Oct 28, 2019 8:07 am
Forum: This is SolarChat !!
Topic: Sun in CaK 27th Oct. '19
Replies: 10
Views: 348

Re: Sun in CaK 27th Oct. '19

Great comparison Stu. I have understood the train is B1800 --> Filter --> Barlow --> camera, am I right ?

Raf
by krakatoa1883
Mon Oct 28, 2019 8:03 am
Forum: This is SolarChat !!
Topic: Few images of October 27th
Replies: 14
Views: 401

Re: Few images of October 27th

Thanks to all :) in the meantime that small active region is now visible at E limb, I can't see if it is spotless or not
by krakatoa1883
Sun Oct 27, 2019 3:50 pm
Forum: This is SolarChat !!
Topic: Few images of October 27th
Replies: 14
Views: 401

Few images of October 27th

Returned to image the Sun after a long pause due to bad weather. A small equatorial active region is rotating into view however is still on the limb and today I could not see it yet. Few prominences were visible on the W and E limb while the disc was peppered with some minor plages and filaments. He...
by krakatoa1883
Sat Oct 26, 2019 8:53 am
Forum: This is SolarChat !!
Topic: Sol from the 24th of October 2019.
Replies: 12
Views: 296

Re: Sol from the 24th of October 2019.

great images, Eric, nice to see some activity around the limb.
by krakatoa1883
Tue Oct 15, 2019 7:36 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Time for selling...
Replies: 7
Views: 528

Re: Time for selling...

There are signs of change coming from multiple approaches to the study of solar activity https://iopscience.iop.org/article/10.3847/2041-8213/aad1ed/meta https://www.sciencedirect.com/science/article/pii/S1364682617307009 https://www.swpc.noaa.gov/news/solar-cycle-25-preliminary-forecast let's wait ...
by krakatoa1883
Tue Oct 15, 2019 9:00 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Time for selling...
Replies: 7
Views: 528

Re: Time for selling...

That graph is quite old now and was much disputed at the time. Current predictions for cycle 25th are quite promising

http://sidc.oma.be/silso/
https://www.nature.com/articles/s41467-018-07690-0

so better not to sell anything for the moment.
by krakatoa1883
Tue Oct 01, 2019 3:07 pm
Forum: This is SolarChat !!
Topic: August and September Sun - longest post ever
Replies: 22
Views: 587

Re: August and September Sun - longest post ever

Thank you for your report, Alexandra, a joy to read. Or was this altitude 700m vs 2181m? I can't say nothing about your PST, of course, however every summer I take my solar equipment from Milan (200 m) to my home in the Italian Dolomites at 1600 m, I can assure you that the difference in terms of sh...
by krakatoa1883
Tue Oct 01, 2019 2:51 pm
Forum: This is SolarChat !!
Topic: Major Prominence! | Sept 30th 2019
Replies: 7
Views: 312

Re: Major Prominence! | Sept 30th 2019

Fine, Marty, great images indeed!
by krakatoa1883
Mon Sep 30, 2019 10:45 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Why my Quark always refused to work...
Replies: 26
Views: 2323

Re: Why my Quark always refused to work...

Hi Magnus Quark chromosphere is very demanding in terms of seeing due the strong amplification factor of the internal telecentric, you need a fairly still air to obtain some decent results. Try on the morning or in the evening within two hours from sunrise or sunset respectively. As far the imaging ...
by krakatoa1883
Sun Sep 29, 2019 6:45 pm
Forum: This is SolarChat !!
Topic: September 25th Images
Replies: 13
Views: 423

Re: September 25th Images

Very nice images, Brian, with fine details and contrast.
by krakatoa1883
Sun Sep 29, 2019 6:42 pm
Forum: This is SolarChat !!
Topic: A small flare on a quiet sun. 280mm scope
Replies: 14
Views: 475

Re: A small flare on a quiet sun. 280mm scope

Great detail and very nice colouring, really impressive.
by krakatoa1883
Sun Sep 22, 2019 6:40 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 49
Views: 5350

Re: Experimenting calcium imaging with small refractors

An apochromat is certainly not necessary, actually my preferred refractor for CaK imaging is a 80 mm f/11.3 TMB achromat. However a 115 mm achromat well corrected @393 nm would be too long, at least for my observing site. This apo is not only well corrected but also much more versatile.
by krakatoa1883
Sun Sep 22, 2019 12:21 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 49
Views: 5350

Re: Experimenting calcium imaging with small refractors

Resuming this thread as I started calcium imaging with a 115mm f/7 Tecnosky triplet refractor. First results seem promising, the scope is better corrected than my previuos ones except the long focus TMB 80. If I am not wrong Peter Zetner obtained some very good images (better than mine) by using of ...
by krakatoa1883
Sun Sep 22, 2019 12:03 pm
Forum: This is SolarChat !!
Topic: animation 20 sept big prom
Replies: 13
Views: 422

Re: animation 20 sept big prom

Great animation, Paul. I too experienced that kind of artifacts when wind or turbulence are strong. Sometimes I am able to get rid of the problem by selecting and stacking only few frames and/or adding some very large alignment poins in AS3! within the dark area.
by krakatoa1883
Sun Sep 22, 2019 11:35 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 43
Views: 2813

Re: What do you think is the most versatile high resolution solar telescope design?

Thanks for the detail. Unfortunately that Meade barlow is now difficult to find except in the used marked but I will try anyway. I tried yesterday to modify an airspaced meniscus Barlow but results were disappointing, no gain in contrast compared with the barlow in the original configuration. May be...
by krakatoa1883
Sat Sep 21, 2019 2:43 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 43
Views: 2813

Re: What do you think is the most versatile high resolution solar telescope design?

Interesting, thanks for sharing. It would be useful to know which brand is the Barlow you used because not all triplet barlows are equal. The spaced element of many triplets is a converging meniscus which is used mainly to correct the divergence of the marginal rays. However other triplets - some GS...
by krakatoa1883
Mon Sep 16, 2019 8:26 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 43
Views: 2813

Re: What do you think is the most versatile high resolution solar telescope design?

I think the graf you are showing for SCT spherochromatism in the blue end is way too exaggerated for optical engineers "blue" means the F line that is 486nm. At this wavelength SCs are still usable as one can see from the graph posted by Christian as well as in spot diagrams for SC. However CaK is ...
by krakatoa1883
Mon Sep 09, 2019 6:30 pm
Forum: This is SolarChat !!
Topic: Prom Animation 25th August '19_Colour Added
Replies: 27
Views: 964

Re: Prom Animation 25th August '19_Colour Added

Absolutely fantastic, Stu.

Is there any tutorial for making animations with IMPPG ? Thks.
by krakatoa1883
Fri Sep 06, 2019 3:42 pm
Forum: This is SolarChat !!
Topic: Quark Testing Round 5
Replies: 6
Views: 333

Re: Quark Testing Round 5

To my eyes negative 1 or zero seem the best, however I agree with Valery, send it back, no good.
by krakatoa1883
Mon Aug 19, 2019 3:22 pm
Forum: This is SolarChat !!
Topic: Saturday Sun, Polar Faculae and Bright Points - 17th August
Replies: 14
Views: 567

Re: Saturday Sun, Polar Faculae and Bright Points - 17th August

Fine images, Mark. I too use my Quark to darken filaments through my Lunt-mod scope, my results depend much on finding the best matching tuning of both systems, not always easy to do.