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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

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by eroel
Thu Jan 16, 2020 5:29 pm
Forum: This is SolarChat !!
Topic: Full/Partial disk 2020-01-16
Replies: 8
Views: 87

Re: Full/Partial disk 2020-01-16

Jochen: Well as you say, the important thing is to be happy when we can get some Sun, so to keep our imaging and processing experimentation on. I live in one of the biggest populated cities, so contamination, eruptions by a near by volcano, earthquakes, (geological and man made quakes made by cars a...
by eroel
Thu Jan 16, 2020 12:35 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 106

Re: Sol from the 15th of January 2020.

Alexandra and guys, thanks for looking and commenting.
Alexandra, yes I also remember Apollo talking about some diagonal line features. like the 3 or more diagonal parallel lines of small white spots on the left next to the big ecuatorial active zone.
Good day,
Eric.
by eroel
Thu Jan 16, 2020 4:34 am
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 106

Sol from the 15th of January 2020.

Hi: A set of CaK and Ha FD´s taken with the 102mm f/9 Meade with a CaK PSTmod, and the Solarmax 90-DS. Thanks for looking. Eric. Sol del 15 de enero 2020-Meade-CaK-PSTmod-2pos.jpg Sol del 15 de enero 2020-Meade-CaK-PSTmod-1pos-neg.jpg Sol del 15 de enero 2020-Meade-CaK-PSTmod-1neg-pos.jpg Sol del 15...
by eroel
Thu Jan 16, 2020 4:29 am
Forum: This is SolarChat !!
Topic: Sol from the 14th of January 2020.
Replies: 3
Views: 53

Sol from the 14th of January 2020.

Hi: Some shots from the 14th, taken with the 3 scopes at the home observatory. Thanks for looking. Eric. Sol del 14 de enero 2020-Meade-CaK-PSTmod-2pos.jpg Sol del 14 de enero 2020-Meade-CaK-PSTmod-2neg-pos.jpg Sol del 14 de enero 2020-Meade-CaK-PSTmod-2pos-neg.jpg Sol del 14 de enero 2020-Solarmax ...
by eroel
Wed Jan 15, 2020 10:44 pm
Forum: This is SolarChat !!
Topic: Full Disk and prominence 15/01/2020
Replies: 12
Views: 121

Re: Full Disk and prominence 15/01/2020

Salvo:
Very nice shots.
Regards,
Eric.
by eroel
Wed Jan 15, 2020 10:42 pm
Forum: This is SolarChat !!
Topic: Full Disc 15 January 2020
Replies: 10
Views: 96

Re: Full Disc 15 January 2020

Rainer:
Nice result in spite of conditions, at home I had about the same problem (thin high clouds).
Fuerte abrazo,
Eric.
by eroel
Tue Jan 14, 2020 4:06 pm
Forum: This is SolarChat !!
Topic: Visual Solar Observing
Replies: 17
Views: 236

Re: Visual Solar Observing

James: As an old timer, I started in the early fifties just doing visual astronomy, at that time it was hard to get some photos because you needed a box camera with a film plate, know how to develop the film and how to process it, then came 35mm film in many versions and 35mm cameras that made thing...
by eroel
Tue Jan 14, 2020 3:37 pm
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 131

Re: Jan 13, 2020 FDs +

Phil:
Super images, perfect FD´s.
Best regards,
Eric.
by eroel
Tue Jan 14, 2020 12:52 am
Forum: This is SolarChat !!
Topic: Sol from the 13th of January 2020.
Replies: 8
Views: 85

Sol from the 13th of January 2020.

Hi: Some FD´s from today in Ha and CaK. Thanks for looking. Eric. Sol del 13 de enero 2020-Solarmax 90-DS-BF30-1pos.jpg Sol del 13 de enero 2020-Solarmax 90-DS-BF30-1pos-neg.jpg Sol del 13 de enero 2020-Solarmax 90-DS-BF30-1neg-pos.jpg Sol del 13 de enero 2020-Meade-CaK-PSTmod-1pos.jpg Sol del 13 de...
by eroel
Tue Jan 14, 2020 12:44 am
Forum: This is SolarChat !!
Topic: Full Disc 13 January 2020
Replies: 9
Views: 99

Re: Full Disc 13 January 2020

Very good mosaics my friend.
Fuerte abrazo,
Eric.
by eroel
Mon Jan 13, 2020 3:47 pm
Forum: This is SolarChat !!
Topic: Sol from the 11th of January 2020.
Replies: 8
Views: 90

Re: Sol from the 11th of January 2020.

Alexandra and guys, thanks for the feedback.
Raf yes, Popocatéptl smokes all days a high altitude yellowish haze, but it also erupts continuously as you saw in the news.
Best regards to all,
Eric.
by eroel
Mon Jan 13, 2020 3:18 pm
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 226

Re: Penumbral Eclipse of the MOON (20200110)

euro:
Superb presentations.
Thanks for sharing them.
Fuerte abrazo,
Eric.
by eroel
Sun Jan 12, 2020 10:35 pm
Forum: This is SolarChat !!
Topic: Sol from the 11th of January 2020.
Replies: 8
Views: 90

Sol from the 11th of January 2020.

Hi: Some shots from the 11th, it was sunny but with a high altitude thin cloud cover. Thanks for looking. Eric. Sol del 11 de enero 2020-Meade-CaK-PSTmod-1pos.jpg Sol del 11 de enero 2020-Meade-CaK-PSTmod-1neg-pos.jpg Sol del 11 de enero 2020-Meade-CaK-PSTmod-1pos-neg.jpg Sol del 11 de enero 2020-So...
by eroel
Sun Jan 12, 2020 10:31 pm
Forum: This is SolarChat !!
Topic: Full Disc 11 January 2020
Replies: 14
Views: 428

Re: Full Disc 11 January 2020

Rainer:
Excellent mosaics.
Fuerte abrazo,
Eric.
by eroel
Sun Jan 12, 2020 10:29 pm
Forum: This is SolarChat !!
Topic: CaK disc and ARs of January 12
Replies: 12
Views: 127

Re: CaK disc and ARs of January 12

Raf:
Beautiful shots.
best regards,
Eric.
by eroel
Sun Jan 12, 2020 8:13 pm
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 237

Re: Full Disc 08 January 2020

Rainer:
Very good Mosaic.
Best regards,
Eric.
by eroel
Sat Jan 11, 2020 3:39 pm
Forum: This is SolarChat !!
Topic: Coronado PST testing
Replies: 31
Views: 691

Re: Coronado PST testing

Alexandra:
Nice to hear that you disassembled the PST with no problem, when I did do my CaK PST, I did heat the joint with a heat gun and it unscrewed easely.
Now starts the experimentation time. :D
Have a nice weekend.
Eric.
by eroel
Sat Jan 11, 2020 4:36 am
Forum: This is SolarChat !!
Topic: Sol from the 9th of January 2020.
Replies: 10
Views: 92

Re: Sol from the 9th of January 2020.

Jochen: The prominences in the CaK shots are taken also with the CaK PST mod, fitted to a 102mm f/9 Meade refractor. BTW, the prominences of the Ha shots were taken with the Ha filter, the FD´s with the Solarmax 90-DS and the higher resolution were taken with a 102mm f/7 Stellarvue refractor working...
by eroel
Sat Jan 11, 2020 4:24 am
Forum: This is SolarChat !!
Topic: Sol from the 10th of January 2020.
Replies: 7
Views: 81

Sol from the 10th of January 2020.

Hi: Now some from the 10th. Thanks for looking, wish you all a nice and sunny weekend. Eric. Sol del 10 de enero 2020-Meade-CaK-PSTmod-2pos.jpg Sol del 10 de enero 2020-Meade-CaK-PSTmod-2pos.jpg Sol del 10 de enero 2020-Meade-CaK-PSTmod-2neg-pos.jpg Sol del 10 de enero 2020-Meade-CaK-PSTmod-2neg.jpg...
by eroel
Sat Jan 11, 2020 4:20 am
Forum: This is SolarChat !!
Topic: Sol from the 9th of January 2020.
Replies: 10
Views: 92

Sol from the 9th of January 2020.

Hi: Got some shots from the 9th, it was sunny but hazy. Thanks for looking and have a nice weekend. Eric. Sol del 9 de enero 2020-Meade-CaK-PSTmod-1pos.jpg Sol del 9 de enero 2020-Meade-CaK-PSTmod-1neg-pos.jpg Sol del 9 de enero 2020-Meade-CaK-PSTmod-1pos-neg.jpg Sol del 9 de enero 2020-Solarmax 90-...
by eroel
Sat Jan 11, 2020 4:15 am
Forum: This is SolarChat !!
Topic: Current AR's in High Res, Full Disc | Jan 9th 2020
Replies: 9
Views: 114

Re: Current AR's in High Res, Full Disc | Jan 9th 2020

Marty:
A nice session and results.
Have a sunny weekend.
Eric.
by eroel
Sat Jan 11, 2020 4:12 am
Forum: This is SolarChat !!
Topic: Full Disk CaK/H-alpha 20200109
Replies: 12
Views: 180

Re: Full Disk CaK/H-alpha 20200109

Salvo:
Beautiful clean and crisp FD´s.
Regards,
Eric.
by eroel
Sat Jan 11, 2020 4:10 am
Forum: This is SolarChat !!
Topic: Full Disc 09 January 2020
Replies: 10
Views: 104

Re: Full Disc 09 January 2020

Rainer:
Beautiful mosaics from the 8th and 9th of January 2020.
Fuerte abrazo.
Eric.
by eroel
Tue Jan 07, 2020 4:32 am
Forum: This is SolarChat !!
Topic: Sol from the 6th of January 2020.
Replies: 4
Views: 77

Sol from the 6th of January 2020.

Hi: Some from today in CaK and Ha. Thanks for looking. Eric. Sol del 6 de enero 2020-Meade-CaK-BF30-2pos.jpg Sol del 6 de enero 2020-Meade-CaK-BF30-2neg-pos.jpg Sol del 6 de enero 2020-Meade-CaK-BF30-2pos-neg.jpg Sol del 6 de enero 2020-Solarmax 90-DS-BF30-1pos.jpg Sol del 6 de enero 2020-Solarmax 9...
by eroel
Tue Jan 07, 2020 4:28 am
Forum: This is SolarChat !!
Topic: Sol from the 4th of January 2020.
Replies: 11
Views: 117

Re: Sol from the 4th of January 2020.

Alexandra, Phil, Salvo, Jochen, Maurits and Valery, thank you very much for commenting.
Best wishes,
Eric.

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