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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 3375 matches

by Valery
Thu Jan 23, 2020 3:21 am
Forum: Solar Reference Library
Topic: HR solar spectra
Replies: 3
Views: 91

Re: HR solar spectra

Hi Christian,

Thanks a lot for this very useful materials. And thanks for your collegues from Paris observatory.


Valery
by Valery
Thu Jan 23, 2020 3:12 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 12
Views: 98

Re: Full Disc 21 January 2020

Nice images, Rainer!

Very well balanced Ha disk. Is this a DS or SS ?


And what an impressive difference between Ha and a white light ! Day and night!

Valery
by Valery
Thu Jan 23, 2020 3:08 am
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 351

Re: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)

Vey nice animation, Alfred.

I believe no one ever does this at such a scale. Very detailed sun chromosphere boiling!


Valery
by Valery
Tue Jan 21, 2020 4:37 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 328

Re: Tuning or bandwidth?

The only reason that SS and DS look identical is: blocking filter has shifted blue or red and transmits the energy from other peak of the etalon. You can try Coronado BF or may be use a BF heater. The nature of the LS80THa PT + Quark fail is that LS80THa has a sweet spot with progressive CWL shift b...
by Valery
Mon Jan 20, 2020 8:36 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 175

Re: Sun and sea

Thanks, Alexandra, for such a nice series of the sea landscape images. I always like the sea where I do live (Black Sea).

And I too very much miss Derek's sea pictures.


Valery
by Valery
Mon Jan 20, 2020 8:30 pm
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 351

Re: 19Jan20 - First Light C11+ARIES D-ERF+Quark (New Images Added)

I like the cropped version better. It endeed a very nice start. I'd make several (2-3) more spacers shorter than this one. Then your setup will be more flexible in choosing of a right scale according to seeing conditions and object of interest nature - prominences, dark filaments, ARs, etc. The fain...
by Valery
Sun Jan 19, 2020 1:58 pm
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 351

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

Hi Alfred, Excellent results. To make them better you need the first is to make several adapters between the reducer and the camera C-mount thread. This will allow you to rise the S/R ratio, to get better sampling, larger FOV and sharper images. The worser the seeing, the longer adapter should be us...
by Valery
Fri Jan 17, 2020 4:39 am
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 328

Re: Tuning or bandwidth?

In my opinion Phil's images are better balanced and they better represent what is seen on the sun. They also consist more shades between the spiculaes (dark bushes on the disk). Rainer's images looks too much contrasty - just like more wide etalons show in a telescope. The space between disk spicula...
by Valery
Tue Jan 07, 2020 5:40 pm
Forum: This is SolarChat !!
Topic: Solar Cycle N°24 Best Of !!!
Replies: 16
Views: 247

Re: Solar Cycle N°24 Best Of !!!

Excellent portfolio of the cycle-24, Jean!

Thanks.


Valery
by Valery
Tue Jan 07, 2020 3:01 am
Forum: This is SolarChat !!
Topic: AR2755 in High Res | Jan 6th 2020
Replies: 15
Views: 179

Re: AR2755 in High Res | Jan 6th 2020

Good start with a new equipment Marty!

Hope you will get better seeing soon.


Valery
by Valery
Tue Jan 07, 2020 3:00 am
Forum: This is SolarChat !!
Topic: Sol from the 4th of January 2020.
Replies: 11
Views: 126

Re: Sol from the 4th of January 2020.

A stunning set of images Eric! Love them all.

Thanks for sharing.


Valery
by Valery
Mon Jan 06, 2020 6:13 am
Forum: This is SolarChat !!
Topic: Jan 5, 2020 LS80
Replies: 11
Views: 130

Re: Jan 5, 2020 LS80

Excellent results, Phil

I like both images and this remind me that the sun is still alive and in about two month I too will start my sun imaging.

Thanks for sharing and CS.


Valery
by Valery
Fri Jan 03, 2020 10:43 am
Forum: This is SolarChat !!
Topic: New Active Region (AR2755?), High Res & Full Discs | Jan 2nd 2020
Replies: 14
Views: 207

Re: New Active Region (AR2755?), High Res & Full Discs | Jan 2nd 2020

Excellent results, Marty!

Thanks for sharing them with us.


Valery
by Valery
Wed Jan 01, 2020 10:59 am
Forum: This is SolarChat !!
Topic: A new AR at the sun face has developed.
Replies: 5
Views: 140

A new AR at the sun face has developed.

Hi all, I just came back from my several minutes duration observing session. I used my new small toy - Lunt LS50THa with 8mm and 6mm eyepieces = 44x and 58x. The disk is blank with two nice small exceptions - new small AR at the extreme limb of the south-east solar face and a small dark filament at ...
by Valery
Mon Dec 30, 2019 9:44 pm
Forum: This is SolarChat !!
Topic: Lunt LS60 DS – Testing a new toy
Replies: 23
Views: 325

Re: Lunt LS60 DS – Testing a new toy

Ronnie,

You need a new b/w camera and you should use 16bit image data to get rid of these "rings".
by Valery
Sun Dec 29, 2019 4:19 am
Forum: This is SolarChat !!
Topic: Dec 22 Session
Replies: 11
Views: 166

Re: Dec 22 Session

Excellent session, Brian! Some impressive reasults for a winter time.

Thanks for sharing these results.

BTW. Can you show the flats for Quark image?


Valery
by Valery
Wed Dec 25, 2019 9:17 am
Forum: This is SolarChat !!
Topic: Full Disc 24 December 2019
Replies: 16
Views: 218

Re: Full Disc 24 December 2019

Nice images, Rainer. Thanks for posting them for us.

Near the solar equator and the east there is a small and weak AR with polarity +/- , so it belongs to Cycle 25 too! May be it really starts to grow in it's activity?


Valery
by Valery
Wed Dec 25, 2019 5:20 am
Forum: This is SolarChat !!
Topic: A new, belong to Cycle-25, sunspot!
Replies: 12
Views: 287

Re: A new, belong to Cycle-25, sunspot!

The second AR, which I described in my original post, becomes a sunspot and obtained it's own number - 12754. So, now the sun consists two AR with sunspots! Lets hope that the quiet period will not be too quiet and will not lasts too long.
by Valery
Tue Dec 24, 2019 11:39 am
Forum: This is SolarChat !!
Topic: A new, belong to Cycle-25, sunspot!
Replies: 12
Views: 287

Re: A new, belong to Cycle-25, sunspot!

I just came back from my backyard where I observed the sun through my new toy - an LS50THa PT. Clounds rolled in and out and prevented to image the sun. However I have seen that the new spot has developed to a real spot and it was clearly visible. On the opposite between the disk center and the limb...
by Valery
Tue Dec 24, 2019 8:10 am
Forum: This is SolarChat !!
Topic: A new, belong to Cycle-25, sunspot!
Replies: 12
Views: 287

A new, belong to Cycle-25, sunspot!

It has developed during last 48 hours. https://www.solarham.net/pictures/archive/dec23_2019_se.jpg https://www.solarham.net/ The AR can be seen right now at the southeast of the sun disk. http://halpha.nso.edu/keep/hag/201912/20191224/20191224080530Lh.jpg Nice to see that the Cycle 25 has began! A n...
by Valery
Thu Dec 19, 2019 8:18 pm
Forum: This is SolarChat !!
Topic: Cycle 25 first spot has formed.
Replies: 7
Views: 213

Re: Cycle 25 first spot has formed.

Still a good start!

This is what we saw just 7 months ago.

Valery
by Valery
Thu Dec 19, 2019 7:36 pm
Forum: This is SolarChat !!
Topic: Cycle 25 first spot has formed.
Replies: 7
Views: 213

Cycle 25 first spot has formed.

Hi all, First Cycle-25 spot has formed! And I saw it today! http://halpha.nso.edu/keep/hag/201912/20191219/20191219194130Ch.jpg https://www.solarham.net/pictures/archive/dec18_2019_ne.jpg https://www.solarham.net/ The AR is a real beauty! Very bright sometime. I observed it with my Lunt LS50THa PT a...
by Valery
Thu Dec 19, 2019 11:18 am
Forum: This is SolarChat !!
Topic: my best pictures of 2019
Replies: 20
Views: 348

Re: my best pictures of 2019

Excellent results!

Valery
by Valery
Tue Dec 17, 2019 10:27 am
Forum: This is SolarChat !!
Topic: Solar Cycle 25 - not looking good......
Replies: 11
Views: 266

Re: Solar Cycle 25 - not looking good......

Merlin66 wrote:
Tue Dec 17, 2019 9:09 am
Valery, while I’d love to agree with you. I think we need to keep an open mind on the subject.
Time will tell.

Ken,

Please, no offence and we here know all these aspects of the subject. And I can gladly discuss all such questions. I spoke about newbies.

Valery
by Valery
Tue Dec 17, 2019 8:15 am
Forum: This is SolarChat !!
Topic: Solar Cycle 25 - not looking good......
Replies: 11
Views: 266

Re: Solar Cycle 25 - not looking good......

http://solarcyclescience.com/forecasts.html The forecasts presented here don't give great news for solar observers over the next few years....... I find such information as defeatist and harmful for amateur astronomy community and especially for those who are less knowelegeable and only plan to div...