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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 15 matches

by Phil Rousselle
Thu Nov 02, 2017 5:03 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 4437

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hi Peter, thank you very much for your extensive reply. Your "raw image" is very large (15000 x 2700 pixels) and video must be more than 8Go !. My processing software cannot "eat" such a big image. Maybe after a binning it could be working. Can't you see Doppler effect induced by the rotational moti...
by Phil Rousselle
Thu Aug 17, 2017 2:23 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20Jun2017 Spectroheliograms: Hydrogen
Replies: 25
Views: 4437

Re: 20Jun2017 Spectroheliograms: Hydrogen

Hi Peter, Very good work ! I would like to know a little bit more. may I ask few questions : - What is the original size of the disk (height in pixels) ? - Do you work with capture in 8, 10, 12 bits ? - What is your method to reduce "transversalium" lines (it looks like what i use) ? - Do you create...
by Phil Rousselle
Thu Aug 17, 2017 8:57 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: shg may 14 2017
Replies: 134
Views: 17191

Re: shg may 14 2017

Bravo pour toutes ces images

Phil
by Phil Rousselle
Sat Jun 24, 2017 10:20 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Spectroheliograms 19Jun2017
Replies: 9
Views: 1810

Re: Spectroheliograms 19Jun2017

Hi Peter, your SHG is very long but works fine. K3 image has a very good bandwidth and contrast
Phil
by Phil Rousselle
Sat Jun 24, 2017 10:07 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Fulvio Mete - Zeeman effect
Replies: 3
Views: 1255

Re: Fulvio Mete - Zeeman effect

Hi, very good spectrum showing zeeman splitting
congratulations to fulvio
by Phil Rousselle
Fri Jul 25, 2014 12:45 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New images with my SHG
Replies: 12
Views: 2213

Re: New images with my SHG

thank you very much
Phil
by Phil Rousselle
Tue Jul 22, 2014 7:24 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New images with my SHG
Replies: 12
Views: 2213

Re: New images with my SHG

Happy to see your responses carbon60 and Peter, I have a page who describes the method and give som explainations as polarity and scale. http://www.astrosurf.com/spectrohelio/magnetographe-en.php If it does not reply enough to your questions, i'll try to continue here Peter, the lower intensity of m...
by Phil Rousselle
Tue Jul 22, 2014 4:30 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New images with my SHG
Replies: 12
Views: 2213

New images with my SHG

hi everybody my last solar observation was on july 3. I'm a very lazy boy now the usual 3 wavelengths http://astrosurf.com/spectrohelio/AR2014/fulldisk/20140703.jpg a Dopplergram (without rotational shift) http://www.astrosurf.com/spectrohelio/AR2014/details/0703-doppler.jpg and a not very good magn...
by Phil Rousselle
Tue Jul 22, 2014 9:18 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 21 June : Ha with SHG
Replies: 16
Views: 2659

Re: 21 June : Ha with SHG

Hi DSobserver,
Are you a new SHG maker/user ?
well, nice pictures and processing
by Phil Rousselle
Tue Jul 22, 2014 9:14 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20140705 Wah!'s SHG Halpha Sun
Replies: 13
Views: 1825

Re: 20140705 Wah!'s SHG Halpha Sun

great job, as usual wah!
Phil
by Phil Rousselle
Tue Jul 22, 2014 9:09 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 03Jul2014 PZ SHG: 2nd installment: Ca H Disks
Replies: 6
Views: 1032

Re: 03Jul2014 PZ SHG: 2nd installment: Ca H Disks

Hi Peter, very good results for SHgrams and spectra
regards,
Phil
by Phil Rousselle
Mon Apr 07, 2014 11:01 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20140405 SHG Sun
Replies: 18
Views: 1754

Re: 20140405 SHG Sun

Hi Wah!
Very good job. Congratulations for H beta and gamma.
Phil
by Phil Rousselle
Thu Apr 03, 2014 6:49 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: spectroheliograms - eruption near AR2027
Replies: 12
Views: 1756

Re: spectroheliograms - eruption near AR2027

Many thanks to all of you

Wah! I haven't done a complete processing but yours is very good. thanks
As you can see on 1st and nd images, sky was not clean. I hope to get better results soon and share again

Phil
by Phil Rousselle
Wed Apr 02, 2014 9:17 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: spectroheliograms - eruption near AR2027
Replies: 12
Views: 1756

Re: spectroheliograms - eruption near AR2027

thank you

Peter, the dopplergram shows approaching matter in white (and black for recession)
As you said, in this range of speed, most of the solar disk seems "flat" and appears grey

Phil
by Phil Rousselle
Wed Apr 02, 2014 8:11 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: spectroheliograms - eruption near AR2027
Replies: 12
Views: 1756

spectroheliograms - eruption near AR2027

hi all here is a H-alpha spectroheliogram (center of line) on 2014 april 2nd. We can see plages and filaments. There is a flare near AR 2027 but no filaments around it http://www.astrosurf.com/spectrohelio/AR2014/details/0402-Ha.jpg At another wavelength (H-alpha + 1.07A) we can see sunspots at phot...