Search found 52 matches

by LTHB
Mon Feb 11, 2019 5:06 pm
Forum: This is SolarChat !!
Topic: The most remarkable spots of the Cycle 24 through a large aperture.
Replies: 8
Views: 127

Re: The most remarkable spots of the Cycle 24 through a large aperture.

Breathtaking! (And also making me a little bit jealous of your fabulous PST etalon...)

Regards,

Frank
by LTHB
Mon Feb 11, 2019 5:06 pm
Forum: SPoD Archive
Topic: The most remarkable spots of the Cycle 24 through a large aperture.
Replies: 7
Views: 113

Re: The most remarkable spots of the Cycle 24 through a large aperture.

Breathtaking! (And also making me a little bit jealous of your fabulous PST etalon...)

Regards,

Frank
by LTHB
Fri Feb 08, 2019 5:57 pm
Forum: Solar Software
Topic: ImPPG version 0.5.4
Replies: 15
Views: 500

Re: ImPPG version 0.5.4

Thanks for your work, very useful!!

Frank
by LTHB
Mon Dec 24, 2018 11:59 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Helium Disk: 08Aug2018 Spectroheliogram
Replies: 14
Views: 748

Re: Helium Disk: 08Aug2018 Spectroheliogram

Hi Peter,

another +100!!

And thanks for the concise and very informative summary on He lines, very much appreciated!

Frank
by LTHB
Mon Dec 17, 2018 5:03 pm
Forum: SPoD Archive
Topic: Helium Disk: 08Aug2018 Spectroheliogram
Replies: 13
Views: 517

Re: Helium Disk: 08Aug2018 Spectroheliogram

Great and interesting work! A new (at least to me) view of the sun!

Have you researched already which layer(s) of the solar atmosphere is/are depicted in this way (in addition to filaments and proms)?

Thanks for showing!

Frank
by LTHB
Mon Dec 17, 2018 5:03 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Helium Disk: 08Aug2018 Spectroheliogram
Replies: 14
Views: 748

Re: Helium Disk: 08Aug2018 Spectroheliogram

Great and interesting work! A new (at least to me) view of the sun!

Have you researched already which layer(s) of the solar atmosphere is/are depicted in this way (in addition to filaments and proms)?

Thanks for showing!

Frank
by LTHB
Sun Dec 09, 2018 11:35 am
Forum: This is SolarChat !!
Topic: AR12674 through 304mm scope. Day two.
Replies: 8
Views: 424

Re: AR12674 through 304mm scope. Day two.

Yes, please keep posting! Helps us through the dark and rainy months.
by LTHB
Sun Dec 09, 2018 11:35 am
Forum: SPoD Archive
Topic: AR12674 through 304mm scope. Day two.
Replies: 9
Views: 421

Re: AR12674 through 304mm scope. Day two.

Yes, please keep posting! Helps us through the dark and rainy months.
by LTHB
Mon Dec 03, 2018 1:46 am
Forum: This is SolarChat !!
Topic: Citizen Science
Replies: 24
Views: 1343

Re: Citizen Science

This afternoon I've been digging in my hard drive - found some older images: https://c1.staticflickr.com/5/4811/44336076620_cb288fd7c1_o.jpg https://c1.staticflickr.com/5/4837/31212761867_1ddbd8875a_o.jpg https://c1.staticflickr.com/5/4906/45239311535_321e005ffe_o.jpg https://c1.staticflickr.com/5/4...
by LTHB
Tue Nov 27, 2018 8:53 pm
Forum: This is SolarChat !!
Topic: Citizen Science
Replies: 24
Views: 1343

Re: Citizen Science

Hi Stu and Alexandra,

a fine idea! Within my possibilities I am certainly willing to contribute! I'll post some images over the weekend.

Frank
by LTHB
Mon Nov 19, 2018 9:44 pm
Forum: Solar Scope Modifications
Topic: optical contact experiments? Anybody?
Replies: 4
Views: 569

Re: optical contact experiments? Anybody?

I have no experience with home-brewed etalons, but Baader says on their webpage that their filter glass is "polished plane to a quarter wavelength on both sides", which makes me a bit sceptical if two Baader filters give a working etalon (allthough I am a big fan of tinkering with optical components...
by LTHB
Sun Oct 14, 2018 7:11 pm
Forum: Solar Astronomy Shop and Swap
Topic: "Astronomie Solaire" - New (French) book on Solar Observation now available
Replies: 15
Views: 1085

Re: "Astronomie Solaire" - New (French) book on Solar Observation now available

Nice! I would also appreciate an English version of your book as unfortunately my broken French is not good enough for really reading books.

Regards,

Frank
by LTHB
Sun Oct 14, 2018 7:06 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: For Science / Math Lovers: Measurement of a Solar Filament Temperature.
Replies: 6
Views: 1182

Re: For Science / Math Lovers: Measurement of a Solar Filament Temperature.

Marvelous! Reading this almost makes me want to seek early retirement so I can pursue small science projects like this, too! Thanks also for the concise summary of the theoretical background, very interesting!

Regards,

Frank
by LTHB
Tue Oct 02, 2018 11:07 pm
Forum: This is SolarChat !!
Topic: Sharpening high resolution CaK images
Replies: 17
Views: 1116

Re: Sharpening high resolution CaK images

Thanks for all the responses and suggestions! Unfortunately I won‘t be able to really appreciate and digest them before the weekend, but then I will! Till then I just wanted to share some reading material I found looking for information on the soft, blurry structures on the CaK images from the DOT: ...
by LTHB
Mon Oct 01, 2018 10:10 pm
Forum: This is SolarChat !!
Topic: Sharpening high resolution CaK images
Replies: 17
Views: 1116

Sharpening high resolution CaK images

Today I found time to process some CaK videos from September 19th. Seeing was quite good, but the sky was a little hazy, transparency not really good. Working on these images I was, again, struggling with the question how much sharpening is appropriate if the aim is to depict the structures of the c...
by LTHB
Tue Sep 11, 2018 9:20 pm
Forum: This is SolarChat !!
Topic: CaK from September 4th, 2018
Replies: 2
Views: 288

CaK from September 4th, 2018

A week ago, on Sept. 4th, I could capture some CaK through a break in the clouds that lasted for a few minutes only, but the seeing was o.k. Unfortunately, after two short videos the sun was gone again before I could get a Barlow lens to get the proper focal lenght for the seeing. Processing the bet...
by LTHB
Fri Aug 31, 2018 6:44 pm
Forum: This is SolarChat !!
Topic: AR12719 High Res at 390nm, CaK and H-a in a 280mm scope.
Replies: 5
Views: 425

Re: AR12719 High Res at 390nm, CaK and H-a in a 280mm scope.

Wonderful images! It is fun and very interesting to see the same region in different wavelengths and to compare structures to see what is visible in which wavelength and how these features correlate. Thanks for showing!

Frank
by LTHB
Tue Aug 28, 2018 5:44 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 1083

Re: 08Aug: Spectral sweep through the Ca K line

Hi Peter,

very instructing and useful for judging if a CaK-filter is on band or not, thanks for posting!

Frank
by LTHB
Mon Aug 27, 2018 7:38 pm
Forum: This is SolarChat !!
Topic: CaK from August 7th with ARIES-ERF
Replies: 17
Views: 914

Re: CaK from August 7th with ARIES-ERF

Hi Valery, unfortunately I did not keep the video (some GBs) for lack of space on my hard drive! The image I posted was processed from a stack of 200 frames - if you think this is still worth reprocessing I can email you the unprocessed tif-file. Next time I get the chance to capture decent CaK I wi...
by LTHB
Mon Aug 27, 2018 7:03 pm
Forum: This is SolarChat !!
Topic: A random area at the Sun chromosphere in CaK with 280mm C11
Replies: 8
Views: 428

Re: A random area at the Sun chromosphere in CaK with 280mm C11

Fantastic, Valery! As Peter said, close to the DOT pictures, as far as I can tell!

I guess you are not really serious about the "relatively poor seeing", are you? Would you mind to tell about your way of processing?

Regards,

Frank
by LTHB
Mon Aug 27, 2018 6:55 pm
Forum: This is SolarChat !!
Topic: August 16 2018 AR12718 3 bands 280mm scope.
Replies: 21
Views: 1020

Re: August 16 2018 AR12718 3 bands 280mm scope.

I hope so, too! I, for one, would very much like to see them!

Frank
by LTHB
Sun Aug 26, 2018 2:07 pm
Forum: This is SolarChat !!
Topic: August 16 2018 AR12718 3 bands 280mm scope.
Replies: 21
Views: 1020

Re: August 16 2018 AR12718 3 bands 280mm scope.

Hi Valery, thanks (somewhat belatedly - I was very busy last week) for the info! I am also shooting CaK at 6ms (or a little less) exposure time, but I mostly stack around 200 frames. I've never used a stack of more than 1000 frames, but I recall that Emil Kraaikamp says somewhere on his website, tha...
by LTHB
Sun Aug 26, 2018 11:42 am
Forum: This is SolarChat !!
Topic: Eliminating bad frames during stacking?
Replies: 9
Views: 515

Re: Eliminating bad frames during stacking?

If you want to exclude a couple of bad frames from stacking in Autostakkert you can also do that by deselecting them in Autostakkert: Just click through the video (loaded in Autostakkert) frame by frame (or/and use the slider to move through the video) and hit the space-bar for each bad frame. You s...
by LTHB
Sun Aug 26, 2018 10:53 am
Forum: This is SolarChat !!
Topic: CaK from August 7th with ARIES-ERF
Replies: 17
Views: 914

Re: CaK from August 7th with ARIES-ERF

Hello Christian, thanks for the suggestion! When I apply a (rather aggressive) unsharp mask only (i.e. no deconvolution) the best I get looks like this: https://c2.staticflickr.com/2/1882/44226015162_549154f95f_o.jpg Unfortunately this does not really seem to improve the image: While the difference ...
by LTHB
Mon Aug 20, 2018 10:11 am
Forum: This is SolarChat !!
Topic: A new small group - images added
Replies: 10
Views: 506

Re: A new small group

Hi Raf,

beautiful shots!

I caught the same group in CaK in late afternoon:

Image

Image

Quite interesting to see how much has changed over a few hours!

Regards,

Frank