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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 2048 matches

by gabrieli
Tue Oct 29, 2019 10:29 am
Forum: This is SolarChat !!
Topic: Offerings from Oct 28
Replies: 9
Views: 541

Re: Offerings from Oct 28

For James and anyone else wondering, the equipment used was an LS152 double stacked with a Quark Chromosphere and processed with a lot of levels work.

Lou
by gabrieli
Mon Oct 28, 2019 11:00 pm
Forum: This is SolarChat !!
Topic: Offerings from Oct 28
Replies: 9
Views: 541

Offerings from Oct 28

It was a pretty good day today with a clear blue sky and dead on tracking which didn't require any correction for the duration of each recording session. The seeing was better than usual. There was a nice variety of scattered proms. I did a little bit of cheating in the last two images which I'm sur...
by gabrieli
Wed Oct 16, 2019 10:39 am
Forum: This is SolarChat !!
Topic: From June 29 and 30
Replies: 11
Views: 791

Re: From June 29 and 30

Hi, Magnus Sorry about the delay in answering you. Here's my suggestion for finding focus. Find focus without the focal reducer first. Then after you add the focal reducer, you need to focus inwards to find the new focus since focal reducers converge the light cone more than before. Also try to shor...
by gabrieli
Wed Oct 16, 2019 10:26 am
Forum: This is SolarChat !!
Topic: Some events from Oct 15
Replies: 11
Views: 494

Some events from Oct 15

The seeing was nothing special but some unique features lured me outside to eke out the following images.

Lou
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by gabrieli
Sun Oct 13, 2019 11:06 am
Forum: This is SolarChat !!
Topic: Large prom on Oct 11
Replies: 12
Views: 497

Re: Large prom on Oct 11

Thanks, Maurits and other viewers

My first reaction on seeing the SPOD image was "Hey, I took an image of that same prom that was almost as good as the SPOD".

Lou
by gabrieli
Fri Oct 11, 2019 9:09 pm
Forum: This is SolarChat !!
Topic: Large prom on Oct 11
Replies: 12
Views: 497

Large prom on Oct 11

The prom from last day put on a nice display today. Conditions were windy with intermittent good seeing. It's sad that some of the best seeing this year is happening in the last few weeks of the season, barring unexpected events that might happen in colder weather. A LS152 was used with a Quark Chro...
by gabrieli
Fri Oct 11, 2019 1:11 am
Forum: SPoD Archive
Topic: Proms and filament from Oct 10
Replies: 10
Views: 846

Proms and filament from Oct 10

I hope the filament is around tomorrow as filaprom. I stayed with one setup for the day's session: an LS152 + Quark Chromosphere recording on a
Blackfly S (3.2MP).

Lou
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by gabrieli
Fri Oct 11, 2019 1:11 am
Forum: This is SolarChat !!
Topic: Proms and filament from Oct 10
Replies: 11
Views: 484

Proms and filament from Oct 10

I hope the filament is around tomorrow as filaprom. I stayed with one setup for the day's session: an LS152 + Quark Chromosphere recording on a
Blackfly S (3.2MP).

Lou
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by gabrieli
Wed Oct 02, 2019 5:36 pm
Forum: This is SolarChat !!
Topic: Active region and proms from Oct 1
Replies: 7
Views: 417

Active region and proms from Oct 1

I sure miss the more active sun from previous years. I don't recall having to boost proms so much just to make them visible. Anyway, here are some results from the previou day taken with my LS152 + Quark Chromosphere in hazy skies.

Lou
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by gabrieli
Sat Sep 28, 2019 9:53 am
Forum: This is SolarChat !!
Topic: A small flare on a quiet sun. 280mm scope
Replies: 14
Views: 621

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

I always look forward to your work, Valery. This is a very fine image. A question: Is the small size of the blocking filter an important part of your technique. If I reduce the size of my blocking filter with similar optics and camera sensor, would the image improve (assuming seeing is good). Thanks...
by gabrieli
Sun Sep 22, 2019 9:41 pm
Forum: This is SolarChat !!
Topic: Large prom frm Sept 22
Replies: 5
Views: 370

Large prom frm Sept 22

I used a Daystar ERF on an AR152 with a 4X telecentric carrying a Quark Combo for the solar image and a c9.25 for the lunar one.

Lou
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by gabrieli
Fri Sep 20, 2019 11:53 pm
Forum: This is SolarChat !!
Topic: Sun & Moon 20th Sept '19
Replies: 15
Views: 627

Re: Sun & Moon 20th Sept '19

Hi, Stu

The lunar images are great but to me the standout is the finely detailed prom.

Lou
by gabrieli
Fri Sep 20, 2019 2:30 am
Forum: This is SolarChat !!
Topic: Large Prom + High res lunar images (Sept 19)
Replies: 12
Views: 543

Re: Large Prom + High res lunar images (Sept 19)

Hi, Jack The H alpha setup included a 150mm Daystar (yellow) ERF + AR152 + 6nm Astronomik filter on a TV 2X Powermate + Quark Combo + 1.5X Barlow on the snout of a 3.2Mp Blackfly. I used the camera at 1500 x1500 pixels to increase the frame rate, increase the scale, and avoid filling the buffer. My ...
by gabrieli
Fri Sep 20, 2019 1:34 am
Forum: This is SolarChat !!
Topic: Large Prom + High res lunar images (Sept 19)
Replies: 12
Views: 543

Large Prom + High res lunar images (Sept 19)

The solar images were taken in fluttery seeing with a Daystar ERF on an AR152 with a 2X TV Powermate + 1.5X Barlow on a 3.2Mp Blackfly. The lunar images were done with a c9.25 with a 2X TV Powermate + 1.5X Barlow on a 3.2Mp Blackfly. The c9.25 has no problem picking up the small craters inside Plato...
by gabrieli
Tue Sep 10, 2019 10:51 am
Forum: This is SolarChat !!
Topic: A day late and a penny short
Replies: 7
Views: 439

Re: A day late and a penny short

Correction: The filter in question was a 685nm IR pass filter that cut below 685nm, including Ha.

Lou
by gabrieli
Tue Sep 10, 2019 1:00 am
Forum: This is SolarChat !!
Topic: H-Alpha close-ups on 6 Sep
Replies: 13
Views: 622

Re: H-Alpha close-ups on 6 Sep

Hi, Alfred

I'm glad you're finding interesting features on the disk.

Do you use your PST etalon at f/10 and then use a barlow or do you use an amplifying telecentric on the scope and then the PST etalon?

Lou
by gabrieli
Tue Sep 10, 2019 12:54 am
Forum: This is SolarChat !!
Topic: A day late and a penny short
Replies: 7
Views: 439

Re: A day late and a penny short

Thanks, Alfred, for your comment. I reached the point of almost panicking when I saw nothing but black. Then I started to check if my ERF cover was still on, to see if the solar finder was misaliged whether the secondary mirror had cracked, and whether the extension tubes had anything stored in them...
by gabrieli
Mon Sep 09, 2019 8:54 pm
Forum: This is SolarChat !!
Topic: A day late and a penny short
Replies: 7
Views: 439

A day late and a penny short

I missed last day's prom display dues to sky conditionsbut I had a chance to catch some remnants today. I used an LS152 for the images below. I started the session trying to figure out why I wasn't seeing anything using this tried and proven setup until I checked the camera nosepiece and found an IR...
by gabrieli
Mon Sep 09, 2019 1:05 am
Forum: This is SolarChat !!
Topic: 45 Minutes in the life of a Quiescent Prom - 8th September
Replies: 22
Views: 809

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

Hi, Mark

The detail in the proms struck me immediately, especially noticeable as the images in the movie seem to change in sharpness quickly from moment to moment. Looks like a great scope.

Lou
by gabrieli
Mon Sep 02, 2019 12:28 am
Forum: This is SolarChat !!
Topic: Proms on Aug31
Replies: 6
Views: 480

Re: Proms on Aug31

Hi, Phil Thanks for your comments. The "smoothness" in the proms, unfortunately, is due to the relatively poor seeing conditions during this session and also the noise reduction in Astra Image. In the past, during better seeing conditons, structural details would be seen in the proms, rather than th...
by gabrieli
Sun Sep 01, 2019 10:43 pm
Forum: This is SolarChat !!
Topic: Proms on Aug31
Replies: 6
Views: 480

Proms on Aug31

These images were actually posted this morning (Sept 1) but, like a few instances before, I stopped short at "preview" and they were lost. Here they are again. There were a couple of interesting proms on Aug 31, including a tiny filaprom. Due to the seeing, I didn't try the larger setup with the c9....
by gabrieli
Fri Aug 30, 2019 9:02 pm
Forum: This is SolarChat !!
Topic: Proms from Aug 29
Replies: 2
Views: 365

Proms from Aug 29

There were quite a few proms around the disk on this day but most were very hard to see. The seeing was awful at midday with high frequency "waves" dfistorting the limb. The processing required was heavy (high medium wavelets on AstarImage + Adaptive Filternoise reduction). Most images show bands th...
by gabrieli
Tue Aug 27, 2019 11:25 am
Forum: This is SolarChat !!
Topic: A better day than yesterday (Aug 24)
Replies: 10
Views: 613

Re: A better day than yesterday (Aug 24)

Thanks, everyone. Alexandra: Although I've been using Astra Image for a couple of years now, I've only ever used its most basic features (L-R deconvolution, wavelets) until a few months ago. It also has some unique noise reduction abilities which are very necessary if there is a lot of processing in...
by gabrieli
Mon Aug 26, 2019 5:48 pm
Forum: This is SolarChat !!
Topic: Happy birthday Alexandra Hart
Replies: 15
Views: 680

Re: Happy birthday Alexandra Hart

Alexandra

Let me add my best wishes for your special day and may the coming year bring good seeing conditions when you need them.

Lou
by gabrieli
Sun Aug 25, 2019 9:50 pm
Forum: This is SolarChat !!
Topic: Prom on Aug 25
Replies: 7
Views: 512

Prom on Aug 25

The seeing in both the early and late morning was a bit worse than previous days though images were ok with more aggressive processing. In the lunar example I used a c9.25 at 4600mm and an LS152 at 3800mm for the prom. I plan to use a 0.67X reducer next day.

Lou
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