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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 3015 matches

by ffellah
Tue Jan 28, 2020 2:05 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

This is the last image, processed differently in ImPPG and Photoshop. The light bridge is much more visible.

Franco
by ffellah
Tue Jan 28, 2020 1:27 am
Forum: This is SolarChat !!
Topic: Full disc 27 January 2020
Replies: 5
Views: 30

Re: Full disc 27 January 2020

Beautiful FD's, Rainer !

Franco
by ffellah
Tue Jan 28, 2020 1:25 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

Hi Bart: thank you for your feedback. According to Airylab you can use the PST etalon in this configuration: you remove it from the scope, take out the lenses and insert it after the telecentric. I use this etalon while my primary Solar Spectrum filter is back in CA for repair, as something happened...
by ffellah
Mon Jan 27, 2020 3:17 pm
Forum: This is SolarChat !!
Topic: AR2757
Replies: 6
Views: 71

Re: AR2757

Very nice sharp images, Paul !

Franco
by ffellah
Mon Jan 27, 2020 2:34 pm
Forum: This is SolarChat !!
Topic: Sun from Brazil (Full disc in three lights - 20200127)
Replies: 10
Views: 90

Re: Sun from Brazil (Full disc in three lights - 20200127)

Really nice views, Ronnie, thank you.

Franco
by ffellah
Mon Jan 27, 2020 1:02 pm
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

Hi Alexandra: thank you for your WOW ! I used the PST etalon on the 203mm HaT solar scope at F/27.5. Marty: thank you for your comments. Yes, it is very nice to see a real sunspot with light bridge and all. Hope we get more, now that Cycle 25 has supposedly started.

Franco
by ffellah
Mon Jan 27, 2020 11:33 am
Forum: This is SolarChat !!
Topic: AR12757 in White Light
Replies: 8
Views: 80

Re: AR12757 in White Light

Very nice results and clear granulation, Salvo.

Franco
by ffellah
Mon Jan 27, 2020 11:30 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

Thank you very much Phil, Eric, Stu, Jochen and Raf for your nice comments.

Franco
by ffellah
Mon Jan 27, 2020 1:47 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

Thank you, Rainer. I processed this second image, that seems to have a bit more detail. Probably a moment of better seeing.

Franco
by ffellah
Mon Jan 27, 2020 1:09 am
Forum: This is SolarChat !!
Topic: Full Disc 26 January 2020
Replies: 8
Views: 48

Re: Full Disc 26 January 2020

You got some excellent results, Rainer. Great resolution on both images.

Franco :bow
by ffellah
Sun Jan 26, 2020 9:47 pm
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

AR2757 January 26th, 2020

Hello all: yesterday I saw that we were going to have intervals of sun this morning. I woke up with the crazy idea to try high resolution with the PST etalon while my other better filter is out until end of February. I was happy to see that AR2757 was visible in some detail, even if the seeing was d...
by ffellah
Sun Jan 26, 2020 9:38 pm
Forum: This is SolarChat !!
Topic: Jan. 26, 2020 LS80
Replies: 8
Views: 50

Re: Jan. 26, 2020 LS80

Great images, Phil.

Franco
by ffellah
Sun Jan 26, 2020 11:36 am
Forum: This is SolarChat !!
Topic: Jan. 25, 2020 FD and AR2757
Replies: 8
Views: 67

Re: Jan. 25, 2020 FD and AR2757

Great looking FD and close up, Phil.

Franco
by ffellah
Fri Jan 24, 2020 11:26 am
Forum: This is SolarChat !!
Topic: 22.01.20202 Prom in very poor seeing.
Replies: 30
Views: 283

Re: 22.01.20202 Prom in very poor seeing.

I am VERY impressed ! You did a fantastic job

Franco :bow :bow
by ffellah
Thu Jan 23, 2020 10:09 pm
Forum: This is SolarChat !!
Topic: Sol from the 21st and 22nd of January 2020.
Replies: 11
Views: 134

Re: Sol from the 21st and 22nd of January 2020.

A beautiful set of very sharp images, Eric. Always a pleasure to see your work.

Franco
by ffellah
Thu Jan 23, 2020 1:05 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 12
Views: 131

Re: Full Disc 21 January 2020

Looking good Rainer !

Franco
by ffellah
Wed Jan 22, 2020 7:00 pm
Forum: This is SolarChat !!
Topic: Solar offerings from Jan. 21, 2020
Replies: 11
Views: 139

Re: Solar offerings from Jan. 21, 2020

Very nice images, Phil. The LS80 is working well for you.

Franco
by ffellah
Wed Jan 22, 2020 4:47 pm
Forum: This is SolarChat !!
Topic: 22.01.20202 Prom in very poor seeing.
Replies: 30
Views: 283

Re: 22.01.20202 Prom in very poor seeing.

A very nice prom image, rusted. I like the set up too !

Franco
by ffellah
Mon Jan 20, 2020 4:44 pm
Forum: This is SolarChat !!
Topic: Sol from the 18th of January 2020.
Replies: 7
Views: 110

Re: Sol from the 18th of January 2020.

Looking good as always, Eric.

Franco
by ffellah
Sun Jan 19, 2020 7:12 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 152

Re: Ha Full Disk & S6348 - 19th January

Hi Mark: splendid full disk. We are having a bit of sun in between clouds, but I was able to see the active region well with the Lunt 50. I could not see the prominence.

Franco :bow
by ffellah
Sun Jan 19, 2020 1:11 pm
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 389

Re: 19Jan20 - First Light with C11+ARIES D-ERF+Quark

Definitely a good start, Alfred.

Franco
by ffellah
Sat Jan 18, 2020 11:41 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 198

Re: Sun and sea

Great pictures and feelings, Alexandra.

Franco
by ffellah
Sat Jan 18, 2020 11:30 pm
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 174

Re: January 17th Session

Lovely images and many good experiments with different cameras, Brian. I am very impressed that you are imaging at these low temperatures: it says a lot on how passionate you are about this ! Great job and thank you for the views: it was snowing here today, a couple of inches. No sunny weather in si...