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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 263 matches

by Dave S
Fri Jan 03, 2020 8:44 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200103) | AR12755 + jet transit
Replies: 16
Views: 347

Re: Today's SUN (20200103) | AR12755 + jet transit

Beautiful images and video, Pedro! You get so many jet transits!
by Dave S
Fri Jan 03, 2020 8:31 pm
Forum: This is SolarChat !!
Topic: January 3 Sun with AR12755
Replies: 11
Views: 146

January 3 Sun with AR12755

I got a full disk and a closeup of AR12755 this morning in between gaps in the clouds.
It's a great illustration of how sunspots start at 40 degrees from the equator early in the cycle.

Full disk with LS80:
SunFullDisk_102224.jpg
SunFullDisk_102224.jpg (625.99 KiB) Viewed 146 times
Closeup of AR12755 with 6" refractor:
AR12755_Sun_104401a.jpg
AR12755_Sun_104401a.jpg (950.25 KiB) Viewed 146 times
by Dave S
Sun Dec 22, 2019 5:39 pm
Forum: This is SolarChat !!
Topic: Solar Analemma 2016-2019
Replies: 20
Views: 311

Re: Solar Analemma 2016-2019

What an awesome and beautiful piece of work, Alexandra!
by Dave S
Sat Dec 21, 2019 8:00 pm
Forum: This is SolarChat !!
Topic: Dec. 20 Full Disk
Replies: 11
Views: 206

Re: Dec. 20 Full Disk

Thanks everybody! Merry Christmas!
by Dave S
Sat Dec 21, 2019 12:31 am
Forum: This is SolarChat !!
Topic: Dec. 20 Full Disk
Replies: 11
Views: 206

Dec. 20 Full Disk

Full disk from today. Just the one tiny active region remnant S6321. No prominences to speak of so I only did the surface exposure.

LS80 DS2
Sun_103146.jpg
Sun_103146.jpg (1.61 MiB) Viewed 206 times
by Dave S
Sat Dec 14, 2019 6:28 pm
Forum: This is SolarChat !!
Topic: Dec 13 Full Disk
Replies: 12
Views: 287

Re: Dec 13 Full Disk

rsfoto wrote:
Sat Dec 14, 2019 5:29 pm
Hi,

Nice disk. ¿ is that a single or double etalon ?
Thanks! That was with an LS80 double stacked. It's impossible for me to get an evenly illuminated full disc with the DS.
by Dave S
Fri Dec 13, 2019 9:04 pm
Forum: This is SolarChat !!
Topic: Dec 13 Full Disk
Replies: 12
Views: 287

Dec 13 Full Disk

Not much going on but I replaced my blue glass and wanted to test it. Not a sunspot to be seen. We've now had 268 spotless days this year and on the verge of an historic low. Tomorrow will be 269 spotless days, the most since the year 1913.
Sun_103739-FullDiskStack.jpg
Sun_103739-FullDiskStack.jpg (2.02 MiB) Viewed 280 times
by Dave S
Fri Dec 13, 2019 6:16 am
Forum: This is SolarChat !!
Topic: NEW!!! animation on our star on December 10th+Prom
Replies: 14
Views: 319

Re: NEW!!! animation on our star on December 10th+Prom

Really wonderful animation and still shots!
by Dave S
Fri Nov 15, 2019 5:59 am
Forum: This is SolarChat !!
Topic: Mercury Transit
Replies: 11
Views: 282

Re: Mercury Transit

Thank you, everybody!
by Dave S
Tue Nov 12, 2019 4:49 am
Forum: This is SolarChat !!
Topic: Mercury Transit
Replies: 11
Views: 282

Mercury Transit

I changed weekend plans and accommodations and found someone to help care for a family member so that I could be home on Monday morning to try for a transit photo. The alarm went off at 6am and I went to the window and saw thick fog. Felt torn by astroimaging drive and warm bed with hugs, back to be...
by Dave S
Mon Aug 26, 2019 3:28 pm
Forum: This is SolarChat !!
Topic: Prom Animation 25th August '19_Colour Added
Replies: 27
Views: 1217

Re: Prom Animation 25th August '19_Colour Added

That's an amazingly sharp and clean animation!
by Dave S
Mon Aug 26, 2019 3:28 pm
Forum: SPoD Archive
Topic: Prom Animation 25th August '19_Colour Added
Replies: 22
Views: 1010

Re: Prom Animation 25th August '19_Colour Added

That's an amazingly sharp and clean animation!
by Dave S
Thu Aug 22, 2019 2:23 am
Forum: This is SolarChat !!
Topic: August 21 FDs LS80 DS
Replies: 9
Views: 554

Re: August 21 FDs LS80 DS

Very nicely done FDs and evenly illuminated. I can't get mine that evenly illuminated.
by Dave S
Mon Aug 19, 2019 4:00 pm
Forum: This is SolarChat !!
Topic: Prominence, Sunday 8/18
Replies: 8
Views: 531

Re: Prominence, Sunday 8/18

marktownley wrote:
Mon Aug 19, 2019 8:29 am
That's a great prom David! How are you finding that camera?
I do like the camera's combination of speed, size, SNR, and price. I don't like the Newton's rings, though. Sometimes my images are at odd orientations because I rotate the camera to minimize the interference pattern.
by Dave S
Sun Aug 18, 2019 8:47 pm
Forum: This is SolarChat !!
Topic: Prominence, Sunday 8/18
Replies: 8
Views: 531

Prominence, Sunday 8/18

This active little prom gave me a nice break from the solar doldrums today. It changed quite a bit while I waited for holes in the clouds.

160mm refractor, 2280mm focal length
LS80 DS2
Basler Ace IMX252
Sun_Prom_120245.jpg
Sun_Prom_120245.jpg (213.78 KiB) Viewed 531 times
by Dave S
Mon Jul 01, 2019 4:09 am
Forum: This is SolarChat !!
Topic: ISS Transit
Replies: 10
Views: 554

Re: ISS Transit

Starry Jack, I use Calsky
by Dave S
Sun Jun 30, 2019 9:32 pm
Forum: This is SolarChat !!
Topic: ISS Transit
Replies: 10
Views: 554

ISS Transit

Not the Sun, but I used the same setup that I use for the Sun (sans H-a filter) to catch the ISS transiting the crescent moon. It wasn't far from the Sun.

6" refractor
Basler Ace
no barlow

Image
by Dave S
Thu Jun 27, 2019 4:37 pm
Forum: This is SolarChat !!
Topic: All things nice
Replies: 22
Views: 989

Re: All things nice

Lovely!
by Dave S
Thu Apr 11, 2019 7:23 pm
Forum: This is SolarChat !!
Topic: Another picture of the lovely AR12378
Replies: 5
Views: 400

Another picture of the lovely AR12378

April 11, 2280mm focal length. Getting it while it lasts:

Image
by Dave S
Wed Apr 10, 2019 9:48 pm
Forum: This is SolarChat !!
Topic: Proms and spot April 9, 2019
Replies: 12
Views: 668

Re: Proms and spot April 9, 2019

Awesome images, Phil!
by Dave S
Mon Apr 08, 2019 11:36 pm
Forum: This is SolarChat !!
Topic: April 8 Sun, New Sunspot and Prominence
Replies: 3
Views: 290

April 8 Sun, New Sunspot and Prominence

It feels very fortunate to get a nice new active region today! Here is AR12731 and a prominence.
AR12738_Sun_122045-1200px.jpg
AR12738_Sun_122045-1200px.jpg (462.97 KiB) Viewed 290 times
NE_Prom_Sun_121523.jpg
NE_Prom_Sun_121523.jpg (423.42 KiB) Viewed 290 times
by Dave S
Wed Feb 20, 2019 11:36 pm
Forum: This is SolarChat !!
Topic: PST on February 20, 2019
Replies: 9
Views: 574

Re: PST on February 20, 2019

That is really nice! Good job with the PST.
by Dave S
Wed Feb 20, 2019 10:52 pm
Forum: This is SolarChat !!
Topic: Solar Tadpole-Like Jets Seen With NASA’S IRIS Add New Clue to Age-Old Mystery
Replies: 1
Views: 250

Solar Tadpole-Like Jets Seen With NASA’S IRIS Add New Clue to Age-Old Mystery

Keep an eye out for tadpoles! Scientists have discovered tadpole-shaped jets coming out of regions with intense magnetic fields on the Sun. Unlike those living on Earth, these “tadpoles” — formally called pseudo-shocks — are made entirely of plasma, the electrically conducting material made of charg...
by Dave S
Mon Feb 18, 2019 6:21 pm
Forum: This is SolarChat !!
Topic: Filament and Prom from Feb 17
Replies: 8
Views: 540

Filament and Prom from Feb 17

We're just getting a few hours of Sun between rainstorms here in California. I captured the filament and a very dim prominence in the morning before the showers came in.
Sun_Filament_094305.jpg
Sun_Filament_094305.jpg (1.06 MiB) Viewed 540 times
Sun_SE_prom_094911.jpg
Sun_SE_prom_094911.jpg (198.28 KiB) Viewed 540 times