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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 539 matches

by krakatoa1883
Mon Jan 20, 2020 8:50 am
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 112

Re: Ha Full Disk & S6348 - 19th January

Great discs, Mark. High pressure is visiting northern Italy too, 1040 hPa today but slightly hazy here.
by krakatoa1883
Wed Jan 15, 2020 10:51 am
Forum: This is SolarChat !!
Topic: More Cycle 25 Activity - 14th January
Replies: 9
Views: 161

Re: More Cycle 25 Activity - 14th January

Thanks, Mark. Another one is just emerging from the limb at an even higher latitude.
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latest_1024_0193.jpg (27.39 KiB) Viewed 81 times
by krakatoa1883
Tue Jan 14, 2020 3:35 pm
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 166

Re: Jan 13, 2020 FDs +

Great discs, the first image is particularly well balanced.
by krakatoa1883
Tue Jan 14, 2020 3:32 pm
Forum: This is SolarChat !!
Topic: CaK disc and ARs of January 12
Replies: 12
Views: 145

Re: CaK disc and ARs of January 12

Thanks Alexandra and Marty, much appreciated your comments.

I love CaK too, I would say even more than H-alpha, unfortunately there is nothing to see visually at this wavelength although I have read that those who had the cataract removed are sensitive to the near UV.
by krakatoa1883
Mon Jan 13, 2020 8:00 am
Forum: This is SolarChat !!
Topic: Sol from the 11th of January 2020.
Replies: 8
Views: 107

Re: Sol from the 11th of January 2020.

Great discs, Eric.

btw, on news channels I've seen Popocatepetl erupting, spectacular!
by krakatoa1883
Mon Jan 13, 2020 7:57 am
Forum: This is SolarChat !!
Topic: Full Disc 11 January 2020
Replies: 14
Views: 445

Re: Full Disc 11 January 2020

Nice disc, how many details there !
by krakatoa1883
Mon Jan 13, 2020 7:54 am
Forum: This is SolarChat !!
Topic: Visual Solar Observing
Replies: 17
Views: 290

Re: Visual Solar Observing

Agree, a binoviewer is a worth addition to any solar setup for observing both in WL and in H alpha. The details of large spot penumbras through a binoviewer are a wonderful sight.
by krakatoa1883
Mon Jan 13, 2020 7:49 am
Forum: This is SolarChat !!
Topic: CaK disc and ARs of January 12
Replies: 12
Views: 145

Re: CaK disc and ARs of January 12

Many thanks to all of you for your kind comments!
by krakatoa1883
Sun Jan 12, 2020 1:37 pm
Forum: This is SolarChat !!
Topic: CaK disc and ARs of January 12
Replies: 12
Views: 145

CaK disc and ARs of January 12

Really bad seeing today with much high and low (thermal) turbulence however I couldn't resist to take some images. No spots but several filaments and two active regions were visible, the unnamed one close to the center of the disc and AR12755 at the SW limb. Through my Quark I could detect only few ...
by krakatoa1883
Sat Jan 11, 2020 4:27 pm
Forum: This is SolarChat !!
Topic: Visual Solar Observing
Replies: 17
Views: 290

Re: Visual Solar Observing

I always observe the Sun visually before any imaging session, if spots are present I draw and count them every time, then go to the Quark for a quick look to H alpha features. Imaging comes last.
by krakatoa1883
Sat Jan 11, 2020 4:23 pm
Forum: This is SolarChat !!
Topic: Sol from the 9th of January 2020.
Replies: 10
Views: 122

Re: Sol from the 9th of January 2020.

Great images as usual, Eric! I am always impressed by the contrast of your CaK PST mod.
by krakatoa1883
Thu Jan 09, 2020 11:39 am
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

A very good result, nice to see our star returning to be active again.
by krakatoa1883
Tue Jan 07, 2020 12:51 pm
Forum: This is SolarChat !!
Topic: AR2755 in High Res | Jan 6th 2020
Replies: 15
Views: 179

Re: AR2755 in High Res | Jan 6th 2020

Great details indeed, your setup works really well. I like much the firts image, very well processed.
by krakatoa1883
Tue Jan 07, 2020 12:46 pm
Forum: This is SolarChat !!
Topic: Jan 5th in Ha
Replies: 13
Views: 169

Re: Jan 5th in Ha

Fine images, Brian, the full disc has a lot of contrast.

It's quite normal for me to move the full disc on the sensor until it gets the best appearance because the sweet spot of my PT module isn't exactly centered in the field.
by krakatoa1883
Tue Jan 07, 2020 12:39 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Using a barlow/powermate on an LS50
Replies: 4
Views: 171

Re: Using a barlow/powermate on an LS50

Yes, it is possible to use a 2.5x Powermate with the Lunt 50 scope, however it will move the focus point very far from the original position. Note that the original focuser of the Lunt provides only a very limited focus range thus using spacers is unavoidable.
by krakatoa1883
Fri Jan 03, 2020 10:11 am
Forum: This is SolarChat !!
Topic: Sun January 1, 2020
Replies: 18
Views: 307

Re: Sun January 1, 2020

Fine images and really impressive bird, Franco. Buon anno!
by krakatoa1883
Fri Jan 03, 2020 10:02 am
Forum: This is SolarChat !!
Topic: AR2755
Replies: 13
Views: 204

Re: AR2755

Great detail, Paul, the main spot seems partially bisected.
by krakatoa1883
Fri Jan 03, 2020 9:59 am
Forum: This is SolarChat !!
Topic: Another 25th cycle spot
Replies: 16
Views: 263

Re: Another 25th cycle spot

Thanks again to all.

@dhkaiser: you can refer to the AAVSO guide which is very helpful in this respect.

Best,
by krakatoa1883
Thu Jan 02, 2020 10:14 am
Forum: This is SolarChat !!
Topic: Sol and its reflection from the last day of 2019.
Replies: 13
Views: 202

Re: Sol and its reflection from the last day of 2019.

Fantastic images, Eric. Have you used any filter for the Moon ?
by krakatoa1883
Thu Jan 02, 2020 10:12 am
Forum: This is SolarChat !!
Topic: Another 25th cycle spot
Replies: 16
Views: 263

Re: Another 25th cycle spot

Thanks to all :)

Yesterday's spot evolved to a B-class bipolar group with no penumbra around the leader spot. This is the second B group of the 25th cycle appeared in less than two weeks.
by krakatoa1883
Wed Jan 01, 2020 1:56 pm
Forum: This is SolarChat !!
Topic: Another 25th cycle spot
Replies: 16
Views: 263

Re: Another 25th cycle spot

Thanks for your comments, this solar minimum made me crazy, happy to see that things are slowly changing toward the next maximum.

Mark, are you still evaluating to purchase a 115 ? ;)
by krakatoa1883
Wed Jan 01, 2020 1:47 pm
Forum: This is SolarChat !!
Topic: New active region in H-alpha 01/10/2020
Replies: 10
Views: 194

Re: New active region in H-alpha 01/10/2020

Beautiful images, I could see that small prom in CaK too.
by krakatoa1883
Wed Jan 01, 2020 1:45 pm
Forum: This is SolarChat !!
Topic: My new observatory
Replies: 14
Views: 259

Re: My new observatory

An effective indoor setup, Alexandra. I remember many beautiful views of the Sun from a window with my Meade ETX 90 placed just on windowsill. It doesn't work in winter, however, due to the underfloor heating.
by krakatoa1883
Wed Jan 01, 2020 11:31 am
Forum: This is SolarChat !!
Topic: Another 25th cycle spot
Replies: 16
Views: 263

Another 25th cycle spot

The new year is starting well, a small spot emerged last night from the SE limb between latitudes -30 and -40 and may be another one seems developing @ NNW of the spot based on SDO movies of these last hours. Today sky is clear although slightly hazy as usual in this season above Milan, however I ha...