The Charlie Bates Solar Astronomy Project is proudly sponsored by the following fine companies:
ImageImageImageImage
Image
Image
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 95 matches

by LTHB
Mon Oct 07, 2019 5:13 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 28
Views: 1066

Re: PST modification - idiots guide

I have tried several helical focusers, most of them were more or less wobbly, so this is the point I would pay attention to, but I have no experience with the focuser you linked to. The best I tried out is this one: https://www.teleskop-express.de/shop/product_info.php/language/en/info/p4591_TS-Opti...
by LTHB
Thu Sep 19, 2019 5:59 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 14May2019 Spectroheliograms: H alpha
Replies: 9
Views: 550

Re: 14May2019 Spectroheliograms: H alpha

Hi Peter!

the more of your images I see, the more I feel I should start to build my own SHG! Extremely interesting project, thanks for showing!

Frank
by LTHB
Thu Sep 19, 2019 5:54 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What do you think is the most versatile high resolution solar telescope design?
Replies: 43
Views: 2804

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

Hi Marty,

a question: Does your SCT have cooling fans? If yes, have you tried if it makes a difference for the "twitchy and nervous looking" CaK image (as you called it in a post above), if the fans are running or not?

Kind regards,

Frank
by LTHB
Wed Sep 11, 2019 9:05 pm
Forum: This is SolarChat !!
Topic: 14 May 2019 Spectroheliograms
Replies: 15
Views: 605

Re: 14 May 2019 Spectroheliograms

Good to hear that you are back, Peter! I haven't had a comparable experience myself, but I can imagine that time probably feels more precious after that. If you want to dedicate some of it to sharing more of your solar work, this will certainly be very much appreciated!

Best wishes,

Frank
by LTHB
Wed Sep 11, 2019 5:11 pm
Forum: This is SolarChat !!
Topic: Convection Cells, Chromosphere Network, Full Disc | HighRes | Sept 11th 2019
Replies: 7
Views: 372

Re: Convection Cells, Chromosphere Network, Full Disc | HighRes | Sept 11th 2019

Very nice high res, Marty! Please keep posting - helps Northerners like me over the cloudy and grey months!

Regards,

Frank
by LTHB
Sun Sep 08, 2019 6:18 pm
Forum: This is SolarChat !!
Topic: 45 Minutes in the life of a Quiescent Prom - 8th September
Replies: 22
Views: 642

Re: 45 Minutes in the life of a Quiescent Prom - 8th September

Fascinating and fun to watch, thanks!

Frank
by LTHB
Sun Sep 08, 2019 2:03 pm
Forum: This is SolarChat !!
Topic: AR2748 in H alpha – 3rd September
Replies: 4
Views: 271

AR2748 in H alpha – 3rd September

Another capture of AR2748 in H alpha from last tuesday, probably my last image for this year as fall is coming with cloudy skies for months, as is usual in northern Germany. https://live.staticflickr.com/65535/48698695486_722b769605_o.jpg Full resolution here: https://live.staticflickr.com/65535/486...
by LTHB
Sun Sep 08, 2019 12:03 pm
Forum: This is SolarChat !!
Topic: September 1st Ha Session
Replies: 7
Views: 395

Re: September 1st Ha Session

Nice close-up of the AR and the proms, Brian! And beautiful disks - my favourite is the inverted one.

Frank
by LTHB
Sun Sep 08, 2019 11:56 am
Forum: This is SolarChat !!
Topic: Sol from the 7th of September 2019.
Replies: 7
Views: 341

Re: Sol from the 7th of September 2019.

Beautiful images, Eric! I had about the same cloud situation around here, but I didn't get such great prom shots!

Frank
by LTHB
Mon Sep 02, 2019 9:25 pm
Forum: This is SolarChat !!
Topic: New AR in h alpha and CaK - 2nd September
Replies: 4
Views: 335

New AR in h alpha and CaK - 2nd September

It was cloudy this afternoon, but I got one gap in the clouds for a CaK video, and about an hour later another gap for three h alpha videos. Seeing was not good,the sky slightly milky, so no high resolution possible, and the resulting images are not really beautiful, but I found it interesting to se...
by LTHB
Mon Sep 02, 2019 11:45 am
Forum: This is SolarChat !!
Topic: CaK - 31st August
Replies: 6
Views: 398

Re: CaK - 31st August

Thanks for the kind words, guys! Valery, if I am calculating correctly, your formula for "good seeing" would mean 0.14"/pixel for my ASI290. At the moment I am happy to have (sometimes!!) short (!) moments with seeing values around 0.4-0.5" at my location - with the Mewlon's f/11.5 the ASI290 has a ...
by LTHB
Sun Sep 01, 2019 1:28 pm
Forum: This is SolarChat !!
Topic: CaK - 31st August
Replies: 6
Views: 398

CaK - 31st August

Another attempt at high res CaK with the Mewlon 210, just a random patch of quiet solar surface: https://live.staticflickr.com/65535/48658984212_a6df6d984d_o.jpg Again the first of a sequence of a dozen videos gave the best image after processing, although the SSM showed values below 0.8 arcseconds ...
by LTHB
Sun Sep 01, 2019 8:44 am
Forum: Solar Scope Modifications
Topic: A big solar newton for ultra narrowband imaging, possible?
Replies: 30
Views: 1311

Re: A big solar newton for ultra narrowband imaging, possible?

Thanks Alex, very informative, in particular the IR images! I've been experimenting with a Mewlon 210 with a front ERF for some weeks now. When I am taking a sequence of a dozen or so CaK videos, after processing the best image almost always proves to come from the first or second video. I suspect t...
by LTHB
Wed Aug 07, 2019 7:11 pm
Forum: This is SolarChat !!
Topic: FD 07-08
Replies: 10
Views: 386

Re: FD 07-08

Nice disk!

This afternoon I was also looking for the two small active regions that GONG showed on pictures taken in the morning, but couldn't find anything in h alpha.
by LTHB
Wed Aug 07, 2019 7:06 pm
Forum: This is SolarChat !!
Topic: Cak Chromosphere
Replies: 12
Views: 529

Re: Cak Chromosphere

Really nice CaK picture, Stu!

Pixinsight is on my list of future projects, too! In particular I'd like to try the different options for deconvolution that PI offers and see if they help improving solar images. Did you do deconvolution in PI?

Frank
by LTHB
Wed Aug 07, 2019 6:58 pm
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 447

Re: CaK – 30th July

Thanks, Brian, Stu and Maurits! Christian, a thermal probe is an interesting idea, but the Mewlon does not have any openings for a cable to pass through. My idea was to use a thermal imaging camera that can measure surface temperatures; I may have access to one, so probably I will try that in the ne...
by LTHB
Thu Aug 01, 2019 1:00 am
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 447

Re: CaK – 30th July

Thanks, Mark&Alexandra! Alexandra, the Mewlon is an uncorrected Dall Kirkham, so tack-sharp on axis, but showing coma off-axis. Even on the rather small sensor of the ASI174 you see it if you are looking closely in the corners, as you did. The asymmetry (top left vs. bottom right) is the result of m...
by LTHB
Wed Jul 31, 2019 8:47 am
Forum: This is SolarChat !!
Topic: CaK – 30th July
Replies: 8
Views: 447

CaK – 30th July

Once again an almost quiet solar surface in CaK, taken yesterday afternoon during a stretch of (for my location) exceptionally good seeing: https://live.staticflickr.com/65535/48420767656_aafa887925_o.jpg A resampled version (150%): https://live.staticflickr.com/65535/48420916337_4bc803e25f_o.jpg Fu...
by LTHB
Tue Jul 30, 2019 9:01 pm
Forum: This is SolarChat !!
Topic: CaK - 28th July
Replies: 7
Views: 357

Re: CaK - 28th July

Thanks folks!

Mark, the scope was the Mewlon 210, double stacked Coronado filters, ASI174. I'm still fiddling with this combination, trying to understand when and why it does or doesn't work

Frank
by LTHB
Mon Jul 29, 2019 8:12 pm
Forum: This is SolarChat !!
Topic: Monday Sunshine 29th July
Replies: 9
Views: 366

Re: Monday Sunshine 29th July

Nice set, Mark!
by LTHB
Mon Jul 29, 2019 8:07 pm
Forum: This is SolarChat !!
Topic: CaK - 28th July
Replies: 7
Views: 357

CaK - 28th July

I‘m a bit late with my CaK, after Alexandra‘s and Mark's marvelous images, but I thought I‘d post it anyway. I often find it instructive to compare different pictures of (almost) the same target to see what different image scales reveal and how much (or how little) difference the local sky condition...
by LTHB
Mon Jul 29, 2019 2:17 pm
Forum: This is SolarChat !!
Topic: Solar Sunday
Replies: 22
Views: 783

Re: Solar Sunday

Top-notch CaK image! Not over-sharpened and very contrasty, really great!
by LTHB
Wed Jul 24, 2019 6:09 pm
Forum: This is SolarChat !!
Topic: CaK – 23rd July
Replies: 9
Views: 393

Re: CaK – 23rd July

Thanks, folks! Mark, I bought the Chroma filter here: https://optcorp.com/products/chroma-blue-filters The transmission graph shows that the filter opens around 360nm and is definitely wide open at 390nm. The same graph can be found in Chroma's flyer (p.4): https://www.chroma.com/sites/default/files...
by LTHB
Wed Jul 24, 2019 11:33 am
Forum: This is SolarChat !!
Topic: Brief Sunshine on the 23rd July
Replies: 8
Views: 332

Re: Brief Sunshine on the 23rd July

Nice close-up!

Good luck with the weather! Meteoblue's seeing predictions for tomorrow are quite good, so maybe a chance for high-res imaging!

Regards,

Frank
by LTHB
Wed Jul 24, 2019 11:24 am
Forum: This is SolarChat !!
Topic: CaK – 23rd July
Replies: 9
Views: 393

CaK – 23rd July

Blue skies here yesterday, but Meteoblue predicted a seeing worse than 2 arcseconds, so I decided to do some testing and tinkering with my CaK setup. After setting up, however, seeing turned out to be much better, with some moments around 0.8“ and better. Unfortunately I had taken out my 90mm scope ...