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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 511 matches

by David_The_Bears_Fan
Thu May 09, 2019 9:58 pm
Forum: This is SolarChat !!
Topic: A late afternoon bonus - 9 May 2019
Replies: 12
Views: 649

Re: A late afternoon bonus - 9 May 2019

Great shot Helen
by David_The_Bears_Fan
Thu May 09, 2019 9:57 pm
Forum: This is SolarChat !!
Topic: AR2740 and 2741 in CaK, 09052019
Replies: 11
Views: 630

Re: AR2740 and 2741 in CaK, 09052019

Awesome images Bart
by David_The_Bears_Fan
Tue May 07, 2019 7:18 pm
Forum: This is SolarChat !!
Topic: 7th May AR2740 and 2741
Replies: 8
Views: 462

Re: 7th May AR2740 and 2741

Great set and love the flare animation!
by David_The_Bears_Fan
Mon May 06, 2019 1:38 pm
Forum: This is SolarChat !!
Topic: Saturday Sunshine - 4th May
Replies: 11
Views: 642

Re: Saturday Sunshine - 4th May

Impressive stuff
by David_The_Bears_Fan
Mon May 06, 2019 1:16 pm
Forum: This is SolarChat !!
Topic: Sunday Sun in Ha 5th May.
Replies: 5
Views: 321

Re: Sunday Sun in Ha 5th May.

Nice work Stu. Cloudy all day here yesterday but I did get a look this morning :beanie:
by David_The_Bears_Fan
Mon May 06, 2019 1:14 pm
Forum: This is SolarChat !!
Topic: AR2740 on May 4th
Replies: 19
Views: 896

Re: AR2740 on May 4th

Super shots Franco
by David_The_Bears_Fan
Mon May 06, 2019 1:13 pm
Forum: This is SolarChat !!
Topic: Sol from the 5th of May 2019.
Replies: 7
Views: 417

Re: Sol from the 5th of May 2019.

Wow, quite the haul of images.
by David_The_Bears_Fan
Mon May 06, 2019 11:08 am
Forum: This is SolarChat !!
Topic: May the 6th Solar Activity
Replies: 8
Views: 455

May the 6th Solar Activity

Early start this morning, looked a bit of a bust when I got up to clouds but they broke around 7:30. Not the best conditions but can't be picky! White light showed some nice detail including some pores. 0605-5.jpg 0605-4.jpg 0605-6.jpg 0605-7.jpg Then on to some Ca-K, some proms and some flaring goi...
by David_The_Bears_Fan
Sun May 05, 2019 7:21 pm
Forum: This is SolarChat !!
Topic: Evening sunshine 5th May
Replies: 10
Views: 489

Re: Evening sunshine 5th May

Cracking images Alexandra. Cloudy all day here today.
by David_The_Bears_Fan
Sat May 04, 2019 10:42 pm
Forum: This is SolarChat !!
Topic: Saturday Sun 4th May '19- New images added
Replies: 14
Views: 695

Re: Saturday Sun 4th May '19

Awesome Stu.
by David_The_Bears_Fan
Sat May 04, 2019 1:34 pm
Forum: This is SolarChat !!
Topic: May the 4th Solar Activity
Replies: 5
Views: 381

May the 4th Solar Activity

Made an early start as the forecast looked more promising early. Paid off with some nice blue skies and the unexpected bonus was that there was a new AR to look at too :beanie: Started off with some white light, an FD using the 1100D / Lacerta Wedge / Continuum filter. Took 130 frames and stacked 50...
by David_The_Bears_Fan
Sat May 04, 2019 1:22 pm
Forum: This is SolarChat !!
Topic: Sol from the 3rd of May 2019.
Replies: 10
Views: 533

Re: Sol from the 3rd of May 2019.

Fantastic trio of scope Eric and some fine images to go with them.
by David_The_Bears_Fan
Thu May 02, 2019 7:52 am
Forum: This is SolarChat !!
Topic: Today's slow SUN (20190501)
Replies: 9
Views: 518

Re: Today's slow SUN (20190501)

Great set, verywiet except for that small filament. Fingers crossed for some new activity soon.
by David_The_Bears_Fan
Mon Apr 29, 2019 9:49 pm
Forum: This is SolarChat !!
Topic: Today's Solar Features in High Res | April 29th 2019
Replies: 6
Views: 438

Re: Today's Solar Features in High Res | April 29th 2019

Great set Marty. Mostly clouds here at the moment but I did get a few minutes at the eyepiece of the Evostar with the Lacerta wedge earlier.
by David_The_Bears_Fan
Mon Apr 29, 2019 2:24 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20190427) | HR H-alpha LUNT152
Replies: 11
Views: 679

Re: Today's SUN (20190427) | HR H-alpha LUNT152

Lovely prominence and a very quiet disk.
by David_The_Bears_Fan
Sun Apr 28, 2019 7:24 pm
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

Thank you Bob
by David_The_Bears_Fan
Sun Apr 28, 2019 9:44 am
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

I just wanted to thank all who have contributed to this thread. I am still not entirely sure which way I am going to go but your input have given me much food for thought. I am not going to rush in to a purchase, as I said above the longer I wait the more funds I have saved which could be seen as a ...
by David_The_Bears_Fan
Sun Apr 28, 2019 8:57 am
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

marktownley wrote:
Sun Apr 28, 2019 8:31 am
Just as a heads up David, I was watching a SM40ii (double stack unit for PST) that went for £278 on ebay yesterday afternoon, buyers market...
I saw that, was tempted.... I'm in no hurry with this and the longer I wait the more I have saved and available to spend!
by David_The_Bears_Fan
Sat Apr 27, 2019 9:28 am
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

I am not as experienced as these people but I am very happy with my Daystar having moved from the PST Love these ED72's. Something about a small ed frac that just does it for me. I have to say I still have not ruled out doing something similar. Having a second scope on a second mount so I can be wa...
by David_The_Bears_Fan
Sat Apr 27, 2019 9:22 am
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

Something else to consider is how front etalons are physically mounted. Thanks Mark. I had come across the website below in another thread which looks promising and the linked version should sit on my evostar dewshield (which is removable but not retractable) quite snugly. https://www.intercon-spac...
by David_The_Bears_Fan
Fri Apr 26, 2019 10:29 pm
Forum: This is SolarChat !!
Topic: 25th April Ha and CaK disk
Replies: 7
Views: 491

Re: 25th April Ha and CaK disk

Super H Alpha and Ca-K images!
by David_The_Bears_Fan
Fri Apr 26, 2019 10:23 pm
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

" Good advice Mark! However, I would add that if you are getting any banding from a front mounted etalon, then its CWL is tuned too high and needs to be replaced as being defective. This seems to be more prevalent these days as the OEMs seem to intend these front etalons as secondary DS etalons nee...
by David_The_Bears_Fan
Thu Apr 25, 2019 10:01 pm
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

Hi David I disagree about the sweet spot on a Lunt Pressure tuned 60, absolutely the best option to avoid this PST problem in my experience. Front mounted etalons are tricky as Mark says. I had a Lunt 75 which was on band in a stripe down the middle only, ok for closeups and narrow FOV but useless ...
by David_The_Bears_Fan
Thu Apr 25, 2019 9:56 pm
Forum: This is SolarChat !!
Topic: Hydrogen Alpha Upgrade
Replies: 19
Views: 1144

Re: Hydrogen Alpha Upgrade

Solar minimum is a buyers market with plenty of kit coming up for sale as peoples interest wanes in a quiet sun. Better to upgrade now than solar max... Thanks Mark. I had been thinking along the same lines ref the above. Interesting your experiences of front mounted etalons and yes I did see Pedro...