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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 21197 matches

by Montana
Tue Jan 21, 2020 8:14 am
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 5
Views: 114

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: 80

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: 158

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: 112

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
by Montana
Sun Jan 19, 2020 4:49 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

Yes, nice to see the new cycle AR in the Calcium K and a nice prom in the Halpha :hamster: :bow

Alexandra
by Montana
Sun Jan 19, 2020 4:47 pm
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

Well done Alfred :hamster: :bow I think you definitely need better seeing and a more active Sun :) I have my new PST mod to test, I am sure that will take a bit of working out as well :)

Alexandra
by Montana
Sun Jan 19, 2020 4:42 pm
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 135

Re: January 17th Session

Some great images Brian, you really are brave to image at such temperatures but in a way I do envy your snow, I do like snow :) Today we have very thick fog all day, I can barely see the bird feeders from the conservatory at the moment. We are also having a record breaking high pressure. On my gauge...
by Montana
Sun Jan 19, 2020 4:33 pm
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 119

Re: Full Disc 17 January 2020

Superb discs Rainer! :hamster: :bow I see the faculae of cycle 24 AR, it is probably very weak so fizzling out. I have a new challenge for you now, polar faculae at the north and south pole are only visible during solar minimum. I see some nice bright points at the north of your WL image and some in...
by Montana
Sun Jan 19, 2020 4:28 pm
Forum: This is SolarChat !!
Topic: FD and big prominence 18-01-2020
Replies: 9
Views: 111

Re: FD and big prominence 18-01-2020

Wow! that is a big prom group :hamster: :bow

Alexandra
by Montana
Sun Jan 19, 2020 4:25 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 158

Re: Sun and sea

Thanks guys :) terrible weather here today, thick freezing fog and getting worse, only good for wrapping in a rug all afternoon.

Alexandra
by Montana
Sat Jan 18, 2020 7:00 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 158

Sun and sea

I really do miss Derek's images of the Sun and the sea. Today we had some sunshine, it was a very cold with a nippy northerly wind but it was so lovely to breathe the sea air and walk the beach. We went to our nearest beach at Crosby and enjoyed the birds, the sea and also the sculptures. So I hope ...
by Montana
Fri Jan 17, 2020 10:07 am
Forum: This is SolarChat !!
Topic: Full Disc 16 January 2020
Replies: 8
Views: 110

Re: Full Disc 16 January 2020

Superb Rainer :hamster: :bow the old cycle AR is coming up to the limb, you need to image in WL today to catch it's faculae :)

Alexandra
by Montana
Fri Jan 17, 2020 10:04 am
Forum: This is SolarChat !!
Topic: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020
Replies: 9
Views: 147

Re: Solar Processing Tutorial (Rapid Workflow) for HA | Jan 16th 2020

Thanks Marty, I too will watch over the weekend :)

Alexandra
by Montana
Thu Jan 16, 2020 2:08 pm
Forum: This is SolarChat !!
Topic: Full/Partial disk 2020-01-16
Replies: 8
Views: 119

Re: Full/Partial disk 2020-01-16

I'm glad you got to see the Sun even if the seeing wasn't that great :hamster: :bow

It is really odd how there is a strange matrix effect in the full disc but when you open it properly in a new tab and resize to normal it is absolutely fine. Very weird.

Alexandra
by Montana
Thu Jan 16, 2020 12:13 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.

Lovely full discs Eric, I was noticing some dark filament like objects in the CaK but they don't seem to replicate in the Halpha. Maybe one of those interesting features that Apollo was talking about (I can't remember what he called them).

Alexandra
by Montana
Thu Jan 16, 2020 12:09 pm
Forum: This is SolarChat !!
Topic: Sol from the 14th of January 2020.
Replies: 3
Views: 67

Re: Sol from the 14th of January 2020.

The CaK is certainly showing up all the new cycle activity very well, super shots Eric :hamster: :bow

Alexandra
by Montana
Thu Jan 16, 2020 12:07 pm
Forum: This is SolarChat !!
Topic: Full Disc 15 January 2020
Replies: 10
Views: 122

Re: Full Disc 15 January 2020

Franco, somehow I don't think a full disc that superb came from a Daystar filter (sorry, am I allowed to say that?).

Rainer, another wonderful disc, you are very lucky to have that filter set :bow
Alexandra
by Montana
Wed Jan 15, 2020 10:03 pm
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 38
Views: 1646

Re: PST modification - idiots guide

OK Mark, it is 35mm

Alexandra
by Montana
Wed Jan 15, 2020 2:17 pm
Forum: This is SolarChat !!
Topic: Full Disk and prominence 15/01/2020
Replies: 12
Views: 162

Re: Full Disk and prominence 15/01/2020

That's a very nice looking loop :hamster: two excellent images :bow

Alexandra
by Montana
Wed Jan 15, 2020 10:17 am
Forum: This is SolarChat !!
Topic: 13-01-2020 Sun Time lapse
Replies: 7
Views: 102

Re: 13-01-2020 Sun Time lapse

Oh yes! a very tiny brightening :hamster: great time lapse Rainer :bow

Alexandra
by Montana
Wed Jan 15, 2020 10:15 am
Forum: This is SolarChat !!
Topic: More Cycle 25 Activity - 14th January
Replies: 9
Views: 161

Re: More Cycle 25 Activity - 14th January

I would be surprised if it were cycle 24 that far north. We are now getting weekly activity, good times are coming :hamster:
Alexandra
by Montana
Wed Jan 15, 2020 10:09 am
Forum: Solar Software
Topic: Genika?
Replies: 3
Views: 147

Re: Genika?

Thanks Paul,
I'll report this back to him.
Alexandra
by Montana
Wed Jan 15, 2020 8:06 am
Forum: Solar Software
Topic: Genika?
Replies: 3
Views: 147

Genika?

Is Genika still going? I have a friend who likes using Genika and wants to transfer the licence to his new computer. However all the e-mails and links for contact to Frederic seem dead. Also there has been no updates for sometime.

Does anyone know if Frederic has given up?

Alexandra
by Montana
Wed Jan 15, 2020 7:54 am
Forum: Solar Scope Modifications
Topic: PST modification - idiots guide
Replies: 38
Views: 1646

Re: PST modification - idiots guide

I don't know Mark, according to the chart ??? https://solarscope.co.uk/filter-systems/ :lol:

I'll have to measure at home tonight :)
Alexandra