Search found 103 matches

by LTHB
Mon Mar 23, 2020 1:17 am
Forum: This is SolarChat !!
Topic: H-alpha disk, March 22nd 2020
Replies: 8
Views: 125

H-alpha disk, March 22nd 2020

I'm a bit late with today's image- lots of beautiful disks already on the forum! https://live.staticflickr.com/65535/49688828926_1211534c26_h.jpg Full size here: https://live.staticflickr.com/65535/49688828926_1211534c26_h.jpg Next thing I have to do is work through Rainer's tutorial for the grid ov...
by LTHB
Mon Mar 23, 2020 1:06 am
Forum: This is SolarChat !!
Topic: Full disk 20-03-2020
Replies: 23
Views: 263

Re: Full disk 20-03-2020

Helpful tutorial - thanks, Rainer!

Regards,

Frank
by LTHB
Sat Mar 21, 2020 2:32 pm
Forum: This is SolarChat !!
Topic: Sunset 19th March 2020
Replies: 15
Views: 228

Re: Sunset 19th March 2020

Extremly beautiful images, Alexandra, thanks! And I like the idea of s Sunlit Earth forum.

Frank
by LTHB
Tue Mar 17, 2020 11:16 am
Forum: This is SolarChat !!
Topic: H-alpha and a bird - March 14th 2020
Replies: 7
Views: 468

Re: H-alpha and a bird - March 14th 2020

Thanks for the kind words, folks (and the honour of a SPoD)! Mark, the filter is an old Coronado (pre-Meade) SM90, double stacked with another one I found last fall and could use now for the first time. I‘m still tinkering with its tuning – it‘s difficult to tell how even the field is when imaging t...
by LTHB
Mon Mar 16, 2020 8:40 am
Forum: This is SolarChat !!
Topic: H-alpha and a bird - March 14th 2020
Replies: 7
Views: 468

H-alpha and a bird - March 14th 2020

First chance to see the sun after a long, long winter, even if through thin clouds, so I got my scope out and captured what's left of the AR - and one bird in the sky. https://live.staticflickr.com/65535/49665450532_273d4c68c1_h.jpg https://live.staticflickr.com/65535/49665450617_164137fd29_b.jpg ht...
by LTHB
Mon Mar 16, 2020 8:40 am
Forum: SPoD Archive
Topic: H-alpha and a bird - March 14th 2020
Replies: 1
Views: 300

H-alpha and a bird - March 14th 2020

First chance to see the sun after a long, long winter, even if through thin clouds, so I got my scope out and captured what's left of the AR - and one bird in the sky. https://live.staticflickr.com/65535/49665450532_273d4c68c1_h.jpg https://live.staticflickr.com/65535/49665450617_164137fd29_b.jpg ht...
by LTHB
Mon Feb 03, 2020 9:11 pm
Forum: Solar Scope Modifications
Topic: Newtonian vs SCT thermal handling with full aperture D-ERF
Replies: 25
Views: 3237

Re: Newtonian vs SCT thermal handling with full aperture D-ERF

Very interesting thread, Marty! I wasn't really sure after reading your description of the problem and your experiments if you could measure somehow if the Baader red filter gets warmer in the Newton - maybe only part of the filter, as Mark suspected? Anyhow, looking at the transmission curves of th...
by LTHB
Fri Dec 27, 2019 11:08 pm
Forum: Solar Software
Topic: New version of ImPPG: faster processing on the GPU
Replies: 24
Views: 5030

Re: New version of ImPPG: faster processing on the GPU

Just downloaded the new version and tried it, works smooth and fast. Thanks a lot for your work!

Regards,

Frank
by LTHB
Mon Oct 07, 2019 5:13 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 38
Views: 4916

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: 1318

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: 4833

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: 1022

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: 588

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: 1070

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: 432

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: 626

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: 548

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: 476

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: 602

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: 602

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: 2763

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: 563

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: 729

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: 644

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: 644

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...