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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 6422 matches

by Carbon60
Tue Jan 21, 2020 6:47 am
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 5
Views: 114

Re: Kanzelhoehe Solar Observatory

Hi Mark, May I suggest that you click on the staff link under ‘presentation’ and email Dr Baumgartner. Let him know your a solar imaging specialist etc... and see if he’ll give you privileged access. I’m sure he’ll be interested when you explain the global reach of Solarchat, point him to your web p...
by Carbon60
Sun Jan 19, 2020 7:24 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 112

Re: Ha Full Disk & S6348 - 19th January

Glad you got some Sun, Mark. Just clouds and fog for most of the day here. Nice FDs.

Stu.
by Carbon60
Sun Jan 19, 2020 7:21 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 204

Re: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Another very fine set of images, Pedro.

Stu.
by Carbon60
Sun Jan 19, 2020 7:18 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 158

Re: Sun and sea

Lovely images, Alexandra. Nice to get out for a breath of fresh air.

Same weather as yours here today. No chance of solar imaging.

Stu.
by Carbon60
Sun Jan 19, 2020 9:51 am
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 119

Re: Full Disc 17 January 2020

Nicely done, Rainer. WL is as blank as a Billiard ball. Roll on cycle 25!

Stu.
by Carbon60
Sun Jan 19, 2020 9:49 am
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 135

Re: January 17th Session

I'm feeling the cold just thinking about it, Brian. You're a brave man.....

Nice images. It's a real pity there isn't much activity (again) other than a few little proms and a filament or two.

Stu.
by Carbon60
Sun Jan 19, 2020 9:44 am
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 18
Views: 257

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

That setup holds lots of promise, Alfred. The conditions have to be exceptionally good for optimal results. Nice first-light image though with good contrast and detail that can only improve with better seeing. Glad the cell is working well as I designed it for the machining guy that Alexandra found....
by Carbon60
Sun Jan 19, 2020 9:32 am
Forum: Solar Reference Library
Topic: Hi Res Solar Spectrum Resource
Replies: 1
Views: 74

Hi Res Solar Spectrum Resource

Maybe one for the reference library:

http://web.kpc.alaska.edu/astronomy/lec ... nhofer.htm

A very high resolution spectrum from UV into IR.

Stu.
by Carbon60
Fri Jan 17, 2020 7:07 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 149

Re: Sol from the 15th of January 2020.

Very nice, Eric. I’m always envious of your Calcium proms :)

Stu.
by Carbon60
Fri Jan 17, 2020 6:59 pm
Forum: This is SolarChat !!
Topic: Full Disc 16 January 2020
Replies: 8
Views: 110

Re: Full Disc 16 January 2020

Another very nice FD, Rainer.

Stu.
by Carbon60
Fri Jan 17, 2020 6:57 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200111) | TV101 & LUNT60
Replies: 14
Views: 339

Re: Today's SUN (20200111) | TV101 & LUNT60

Nice images, Pedro. We’ve a sunny weekend in prospect (mainly Sunday), so looking forward to imaging again at last.

Stu.
by Carbon60
Fri Jan 17, 2020 6:50 pm
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 263

Re: Penumbral Eclipse of the MOON (20200110)

Beautiful images, Pedro. Funny story too.

Stu.
by Carbon60
Tue Jan 14, 2020 6:51 am
Forum: This is SolarChat !!
Topic: Sol from the 13th of January 2020.
Replies: 8
Views: 99

Re: Sol from the 13th of January 2020.

Beautiful, Eric. Very nice FDs.

Stu.
by Carbon60
Tue Jan 14, 2020 6:48 am
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 166

Re: Jan 13, 2020 FDs +

Nice images, Phil.

Your full disks are beautifully uniform. Nice close views too.

Stu.
by Carbon60
Tue Jan 14, 2020 6:43 am
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 38
Views: 1646

Re: PST modification - idiots guide

Looking good, Alexandra.

Stu.
by Carbon60
Tue Jan 14, 2020 6:38 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Geomagnetic Unrest Jan 2020
Replies: 4
Views: 193

Re: Geomagnetic Unrest Jan 2020

Many thanks Brian, Alexandra and Mark.

Stu.
by Carbon60
Sat Jan 11, 2020 8:43 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Geomagnetic Unrest Jan 2020
Replies: 4
Views: 193

Geomagnetic Unrest Jan 2020

The past few days saw an outbreak of beautiful aurora around the poles although there was no significant solar activity to be seen. What did occur was the interplanetary solar wind, which carries with it a magnetic filed, flipped south sporadically and this allowed the solar wind to penetrate deeper...
by Carbon60
Fri Jan 10, 2020 9:16 am
Forum: Forum Support Issues
Topic: Very slow
Replies: 18
Views: 362

Re: Very slow

Hi Alexandra, It seems to be very variable. Mostly okay, but occasionally very slow, as you say. All but the smallest of images (less than a few hundred kB i.e. thumbnails) should be independently located and just linked to in order to save space. I must say, I’m surprised that our total available s...
by Carbon60
Thu Jan 09, 2020 6:27 am
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

Very nice FD, Rainer.

Stu.
by Carbon60
Thu Jan 09, 2020 6:25 am
Forum: This is SolarChat !!
Topic: Jan. 7 and 8, 2020 LS80
Replies: 12
Views: 175

Re: Jan. 7 and 8, 2020 LS80

Very nice images, Phil. Great to see the emerging activity.

Stu.
by Carbon60
Tue Jan 07, 2020 8:15 pm
Forum: This is SolarChat !!
Topic: Mercury Transit in 3D
Replies: 7
Views: 145

Re: Mercury Transit in 3D

Many thanks, everyone.

Sorry it doesn’t work for you Mark & Alexandra.

Stu.
by Carbon60
Tue Jan 07, 2020 8:12 pm
Forum: This is SolarChat !!
Topic: AR2755 2020/1/5
Replies: 12
Views: 178

Re: AR2755 2020/1/5

Very nice indeed, Olivier. A superb debut.

Stu.
by Carbon60
Tue Jan 07, 2020 8:08 pm
Forum: This is SolarChat !!
Topic: AR2755 in High Res | Jan 6th 2020
Replies: 15
Views: 179

Re: AR2755 in High Res | Jan 6th 2020

Lovely images, Marty. Just clouds and rain here, so it’s nice to see what I’m missing.

Stu.
by Carbon60
Tue Jan 07, 2020 8:00 pm
Forum: This is SolarChat !!
Topic: Full Disc 06 January 2020
Replies: 8
Views: 115

Re: Full Disc 06 January 2020

Very nicely done, Rainer.

Stu.
by Carbon60
Tue Jan 07, 2020 7:56 pm
Forum: This is SolarChat !!
Topic: Jan 6, 2020 LS80
Replies: 10
Views: 138

Re: Jan 6, 2020 LS80

Nice work, Phil. Good contrast in those close view filaments.

Stu.