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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 21217 matches

by Montana
Tue Jan 28, 2020 7:37 am
Forum: This is SolarChat !!
Topic: Full disc 27 January 2020
Replies: 5
Views: 30

Re: Full disc 27 January 2020

Superb fine full discs Rainer and wow! love the close ups too :hamster: :bow

Alexandra
by Montana
Mon Jan 27, 2020 2:09 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)

What an amazing looking Sun in all three lights :bow :hamster: it is a long time since I last said that :)

Alexandra
by Montana
Mon Jan 27, 2020 12:31 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Further Geomagnetic Unrest 21st 23rd Jan 2020
Replies: 4
Views: 68

Re: Further Geomagnetic Unrest 21st 23rd Jan 2020

Nice to see you picked this up Stuart :bow :hamster: terrible weather here for a week with fog and drizzle. Amazing how a Monday morning brings sunshine ;)
Alexandra
by Montana
Mon Jan 27, 2020 12:28 pm
Forum: This is SolarChat !!
Topic: AR12757 in White Light
Replies: 8
Views: 80

Re: AR12757 in White Light

What a wonderful WL shot, beautiful granulation and great penumbral detail :bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 12:25 pm
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 15
Views: 142

Re: AR2757 January 26th, 2020

Wow! was this taken with a PST, amazing detail :bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 12:24 pm
Forum: This is SolarChat !!
Topic: AR2757
Replies: 6
Views: 71

Re: AR2757

Stunning images Paul! this big AR is very complex indeed, and I really like the limb shot of the new AR, it is very difficult to get such good limb images, well done :bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 12:19 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200125) | FDs H-alpha
Replies: 12
Views: 199

Re: Today's SUN (20200125) | FDs H-alpha

Lovely images Pedro, some nice prominences :bow :hamster: I expected to see the pictures from the 60mm PST mod :)
Alexandra
by Montana
Mon Jan 27, 2020 12:12 pm
Forum: This is SolarChat !!
Topic: Sol from the 25th of January 2020.
Replies: 6
Views: 60

Re: Sol from the 25th of January 2020.

Beautiful pictures Eric, so sharp and yet so smooth :bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 12:09 pm
Forum: This is SolarChat !!
Topic: Jan. 26, 2020 LS80
Replies: 8
Views: 50

Re: Jan. 26, 2020 LS80

Wow! superb detail Phil, the full disc looks lovely at full size
:bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 10:29 am
Forum: This is SolarChat !!
Topic: Full Disc 26 January 2020
Replies: 8
Views: 48

Re: Full Disc 26 January 2020

Wow!! looks like I am missing a fabulous Sun at the moment, we have had endless days of grey drizzle here but looks like the skies have cleared today. The spot in WL is amazing!! so large! and also there are a lot of bright polar faculae points in the south. I might download these two images and ove...
by Montana
Mon Jan 27, 2020 10:24 am
Forum: This is SolarChat !!
Topic: PST MODs
Replies: 7
Views: 221

Re: PST MODs

A very good looking collection Pedro :) that 60mm conversion looks great!

Alexandra
by Montana
Mon Jan 27, 2020 10:21 am
Forum: This is SolarChat !!
Topic: FullDisc 24 January 2020
Replies: 11
Views: 110

Re: FullDisc 24 January 2020

Lots of fabulous images to delight my eyes on and thanks for all the other interesting info too, I really must learn how to use tilting Sun :)
:bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 10:17 am
Forum: This is SolarChat !!
Topic: Jan. 25, 2020 FD and AR2757
Replies: 8
Views: 67

Re: Jan. 25, 2020 FD and AR2757

Wow! that AR is a real beauty, lots of dark arch filaments which means plenty of action. Would have looked good in a time lapse :bow :hamster:
Alexandra
by Montana
Mon Jan 27, 2020 10:15 am
Forum: This is SolarChat !!
Topic: Jan. 24, 2020 at the limb
Replies: 9
Views: 82

Re: Jan. 24, 2020 at the limb

That is a cracking image! why, because the detail all along the rim with beautifully defined spicules is a pleasure to see, you must have had lovely seeing.
:bow :hamster:
Alexandra
by Montana
Fri Jan 24, 2020 10:25 am
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.

These are fabulous Eric, it took me ages to look through, there is so much minute detail in each image to peruse :bow :bow

The weather here has been terrible, drizzle and fog for 6 days now, very gloomy and miserable.

Alexandra
by Montana
Thu Jan 23, 2020 10:10 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 12
Views: 131

Re: Full Disc 21 January 2020

Superb images Rainer, I can't really spot any polar faculae in the WL image, never mind. It is a nice comparison between WL and Halpha.

:bow :hamster:

Alexandra
by Montana
Thu Jan 23, 2020 10:04 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 think it is a super shot of the prom, so much detail in such a faint one :hamster: :bow

Alexandra
by Montana
Thu Jan 23, 2020 10:02 am
Forum: This is SolarChat !!
Topic: Solar offerings from Jan. 21, 2020
Replies: 11
Views: 139

Re: Solar offerings from Jan. 21, 2020

I would say there is lots to see, I think there must be about 5 bright areas on the disc and a super prominence, and this is solar minimum :hamster:
:bow
Alexandra
by Montana
Tue Jan 21, 2020 8:14 am
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 8
Views: 194

Re: Kanzelhoehe Solar Observatory

Wow!! that would be a trip of lifetime. When I have e-mailed staff there they have always replied so I should think they are probably rather friendly.
Good luck and keep us posted :hamster:

Alexandra
by Montana
Mon Jan 20, 2020 12:19 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.

At least 4 interesting bright areas of plage in the high northern hemisphere in the CaK :hamster: a lovely set Eric :bow

Alexandra
by Montana
Mon Jan 20, 2020 12:16 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 198

Re: Sun and sea

Thanks for the kind words :)
Rainer, if you did just stand there in the sea you would get hypothermia very quickly :lol:

Alexandra
by Montana
Sun Jan 19, 2020 4:52 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 152

Re: Ha Full Disk & S6348 - 19th January

Wow! that new region is really getting bright, nice work Mark :hamster: :bow sadly thick fog all day here so far and now it is getting dark it is getting thicker. Currently at 1048mb on our gauge at the moment, will photograph it if it gets higher :)

Alexandra