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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 26656 matches

by marktownley
Thu Jan 23, 2020 6:44 am
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 8
Views: 158

Re: Kanzelhoehe Solar Observatory

Thanks for the ideas folks. I will drop them an email this weekend.
by marktownley
Thu Jan 23, 2020 6:43 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 12
Views: 97

Re: Full Disc 21 January 2020

An excellent pair of disks Rainer
by marktownley
Thu Jan 23, 2020 6:42 am
Forum: This is SolarChat !!
Topic: 22.01.20202 Prom in very poor seeing.
Replies: 15
Views: 110

Re: 22.01.20202 Prom in very poor seeing.

Great prom shot! Love to see more pictures of the setup / dome etc.
by marktownley
Thu Jan 23, 2020 6:40 am
Forum: This is SolarChat !!
Topic: Solar offerings from Jan. 21, 2020
Replies: 10
Views: 96

Re: Solar offerings from Jan. 21, 2020

Excellent images Phil, some nice emerging flux regions there.
by marktownley
Thu Jan 23, 2020 6:30 am
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 16
Views: 301

Re: Tuning or bandwidth?

You'll notice a huge difference with DS when the sun is busy Phil
by marktownley
Thu Jan 23, 2020 6:23 am
Forum: Solar Reference Library
Topic: HR solar spectra
Replies: 3
Views: 83

Re: HR solar spectra

Very useful, i'll pop in the library :)
by marktownley
Mon Jan 20, 2020 9:16 pm
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 8
Views: 158

Kanzelhoehe Solar Observatory

I take a group of students skiing for a week next month, imagine my surprise when the tour company switched the resort we are staying at from northern Italy to Austria, only for me to find our hotel is less than 100 metres from the Kanzelhoehe solar Observatory https://www.kso.ac.at/index_en.php Any...
by marktownley
Mon Jan 20, 2020 6:21 am
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 118

Re: Ha Full Disk & S6348 - 19th January

Thanks everyone for the kind words, looks like there's a pair of pores still visible, and patch of plage in both Ha and CaK, but it's not developed any further than that.
by marktownley
Sun Jan 19, 2020 8:18 pm
Forum: This is SolarChat !!
Topic: Sol from the 18th of January 2020.
Replies: 7
Views: 86

Re: Sol from the 18th of January 2020.

Nice images Eric, hope the rain stops soon!
by marktownley
Sun Jan 19, 2020 6:38 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 118

Re: Ha Full Disk & S6348 - 19th January

Hope you manage to get a full disk of it soon Rainer :)
by marktownley
Sun Jan 19, 2020 5:46 pm
Forum: This is SolarChat !!
Topic: Lunt Heating Module test
Replies: 7
Views: 125

Re: Lunt Heating Module test

Useful info, thanks Dan.
by marktownley
Sun Jan 19, 2020 5:39 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 118

Re: Ha Full Disk & S6348 - 19th January

Thanks everyone, HMI image showing a pair of pores in that region of S6348. You guys further west of the UK should get to see this develop, hopefully designated an active region. (open in new window full size to see the pores).
hmi1898.gif
hmi1898.gif (2.3 MiB) Viewed 102 times
by marktownley
Sun Jan 19, 2020 4:32 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 118

Ha Full Disk & S6348 - 19th January

Super high pressure sat over the UK this weekend, in excess of 1044mb, has meant relatively clear skies in between the spells of transient fog patches, however by this afternoon the fog was gone and I was surprised how much higher the sun was in the sky compared to just a month ago, significantly fe...
by marktownley
Sun Jan 19, 2020 10:58 am
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 123

Re: Full Disc 17 January 2020

Excellent disks RAiner! Keep them coming!
by marktownley
Sun Jan 19, 2020 10:56 am
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 144

Re: January 17th Session

Nice set of images Brian in challenging conditions. Looks like you got a cycle 25 bright point at the 10 o'clock position on the full disk.
by marktownley
Sun Jan 19, 2020 10:53 am
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 338

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

Does have promise Alfred, but I think the seeing needs to be better to exploit its capabilities to the full.
by marktownley
Sun Jan 19, 2020 10:51 am
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 16
Views: 301

Re: Tuning or bandwidth?

I think your images are excellent Phil, but I do know what you mean. When I double stack my Lunt 50mm etalon with my Quark, I don't get as much contrast as when I double stack the same Quark on my SM90ii. I wonder whether the difference is not a matter of bandwidth or tuning, rather the finesse (ref...
by marktownley
Sun Jan 19, 2020 10:32 am
Forum: This is SolarChat !!
Topic: FD and big prominence 18-01-2020
Replies: 9
Views: 116

Re: FD and big prominence 18-01-2020

Nice captures Salvo!
by marktownley
Sun Jan 19, 2020 9:42 am
Forum: Solar Reference Library
Topic: Hi Res Solar Spectrum Resource
Replies: 1
Views: 80

Re: Hi Res Solar Spectrum Resource

Great resource Stu, thanks for finding. I'll pop in the library.
by marktownley
Sun Jan 19, 2020 9:37 am
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 166

Re: Sun and sea

Great shots Alexandra, it's nice round there.
by marktownley
Sat Jan 18, 2020 9:54 am
Forum: This is SolarChat !!
Topic: Lunt Heating Module test
Replies: 7
Views: 125

Re: Lunt Heating Module test

Thanks for sharing. Battery doesn't seem to last long.
by marktownley
Fri Jan 17, 2020 1:05 pm
Forum: This is SolarChat !!
Topic: Newton rings or reflections
Replies: 6
Views: 144

Re: Newton rings or reflections

Looks like pixel bleed to me - quite simply too overexposed...