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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 408 matches

by Astrophil
Mon Jan 27, 2020 2:04 am
Forum: This is SolarChat !!
Topic: Full Disc 26 January 2020
Replies: 8
Views: 46

Re: Full Disc 26 January 2020

Hey Rainer, that looks like a real sunspot. Great images.

Phil
by Astrophil
Mon Jan 27, 2020 2:02 am
Forum: This is SolarChat !!
Topic: AR2757 January 26th, 2020
Replies: 11
Views: 86

Re: AR2757 January 26th, 2020

Very nice, Franco. It's great to see some hi-res images again. Hope your skies continue to be favorable.

Phil
by Astrophil
Sun Jan 26, 2020 9:37 pm
Forum: This is SolarChat !!
Topic: Jan. 26, 2020 LS80
Replies: 8
Views: 44

Jan. 26, 2020 LS80

Another nice day for imaging. The LS80 did it's job.
Hope you get some some clear skies soon.

Phil
20200126_111706_fd.jpg
20200126_111706_fd.jpg (586.12 KiB) Viewed 44 times
20200126_104858_n.jpg
20200126_104858_n.jpg (321.41 KiB) Viewed 44 times
20200126_104059_AR2757.jpg
20200126_104059_AR2757.jpg (437.93 KiB) Viewed 44 times
20200126_113128_Limb.jpg
20200126_113128_Limb.jpg (355.41 KiB) Viewed 44 times
20200126_104619_prom_invc.jpg
20200126_104619_prom_invc.jpg (158.52 KiB) Viewed 44 times
by Astrophil
Sun Jan 26, 2020 3:18 am
Forum: This is SolarChat !!
Topic: Jan. 25, 2020 FD and AR2757
Replies: 8
Views: 65

Jan. 25, 2020 FD and AR2757

It's nice to see a little more solar activity. AR 2757 put on a small but rather active show with filaments flying around. The SE limb has a region of activity coming into view and a prom to the NE looked good. Seeing deteriorated before I could image it. The LS80 was used again today. Phil 20200125...
by Astrophil
Sat Jan 25, 2020 12:00 am
Forum: This is SolarChat !!
Topic: FullDisc 24 January 2020
Replies: 11
Views: 106

Re: FullDisc 24 January 2020

Rainer, another great disk and, wow! a spot.

Phil
by Astrophil
Fri Jan 24, 2020 11:58 pm
Forum: This is SolarChat !!
Topic: Jan. 24, 2020 at the limb
Replies: 9
Views: 79

Re: Jan. 24, 2020 at the limb

The image was taken at 17:53 UT and the feature did not last very long. Maybe it will show again.

Phil
by Astrophil
Fri Jan 24, 2020 10:55 pm
Forum: This is SolarChat !!
Topic: Jan. 24, 2020 at the limb
Replies: 9
Views: 79

Jan. 24, 2020 at the limb

Today a brief thinning of the clouds allowed for one image. GONG showed a bright region on the southeast limb and that was the target. I don't know if anything will result from it but it looked interesting enough to post.

Phil

20200124_125244_.jpg
20200124_125244_.jpg (207.42 KiB) Viewed 79 times
20200124_125244_inv2c.jpg
20200124_125244_inv2c.jpg (207.48 KiB) Viewed 79 times
by Astrophil
Fri Jan 24, 2020 5:40 pm
Forum: This is SolarChat !!
Topic: Sol from the 21st and 22nd of January 2020.
Replies: 11
Views: 132

Re: Sol from the 21st and 22nd of January 2020.

Beautiful disks and fantastic proms! Well done, Eric.

Phil
by Astrophil
Fri Jan 24, 2020 5:37 pm
Forum: This is SolarChat !!
Topic: Solar offerings from Jan. 21, 2020
Replies: 11
Views: 138

Re: Solar offerings from Jan. 21, 2020

Thanks all for the kind comments.
Alexandra, yes, I agree that there is lots to see especially for the experienced observer. I guess the kid in me wants more.

Phil
by Astrophil
Fri Jan 24, 2020 5:30 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Re: Tuning or bandwidth?

Mark, those are encouraging words and tuning should be easier when the activity picks up as well. The waiting is shear agony.
Maurits, thanks.

Phil
by Astrophil
Wed Jan 22, 2020 3:00 am
Forum: This is SolarChat !!
Topic: 19Jan20 - First Light C11+ARIES D-ERF+Quark (Animated GIF Added)
Replies: 24
Views: 387

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

I really like both cropped images, Alfred. So much detail to see, especially the first one. Nicely done.

Phil
by Astrophil
Wed Jan 22, 2020 2:52 am
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 12
Views: 131

Re: Full Disc 21 January 2020

Great FD and capture of those very faint proms! No pores or spots visible to me in WL, yet.

Phil
by Astrophil
Wed Jan 22, 2020 2:47 am
Forum: This is SolarChat !!
Topic: Solar offerings from Jan. 21, 2020
Replies: 11
Views: 138

Solar offerings from Jan. 21, 2020

Today began with clear skies, a lot of wind, and cold (for Florida). Seeing was challenging and the results show. Not much to see today in the Lunt 80. Here's what you missed if you were clouded out. First off a full disk overview, then some bright spots, and finally something sticking out of the Su...
by Astrophil
Wed Jan 22, 2020 2:33 am
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Re: Tuning or bandwidth?

Thanks for the explanation, Valery. I won't waste time with the pressure tuning and Quark combo. I'll try heating the blocking filter but will have to think about getting a Coronado BF for a while. Lunt Solar might have some suggestions or remedies. Rainer, I too noticed a slight improvement with th...
by Astrophil
Mon Jan 20, 2020 10:22 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Re: Tuning or bandwidth?

I appreciate the great info. I'm still working on proper tuning of the two etalons to maximize contrast. Interesting to note the difference between your Lunt and Coronado double stacks Mark. Finesse or maybe blocking filter differences? I guess more study is needed. I tried stacking the Lunt pressur...
by Astrophil
Fri Jan 17, 2020 5:24 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Re: Tuning or bandwidth?

Taste aside for a moment. In order to image bright plage, dark filaments, and to easily visualize filaproms, is a certain minimum bandwidth required or is it only camera settings or selective post processing? My reference library is lacking and knowledge of this subject inadequate so any thoughts wo...
by Astrophil
Thu Jan 16, 2020 8:10 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Re: Tuning or bandwidth?

Thank you so much, Rainer. I like your results of reprocessing the image. Much better, even using the compressed jpeg. I have not calibrated my monitors in a long time. That will be next on my to do list. I tend to agree that grey scale images show the beat detail. Someone once said that if the imag...
by Astrophil
Thu Jan 16, 2020 6:05 pm
Forum: This is SolarChat !!
Topic: Penumbral Eclipse of the MOON (20200110)
Replies: 20
Views: 321

Re: Penumbral Eclipse of the MOON (20200110)

Enjoyable images and funny story. At least you took the lens cap off.

Phil
by Astrophil
Thu Jan 16, 2020 5:58 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 166

Re: Sol from the 15th of January 2020.

Always exceptional images! Thanks, Eric.

Phil
by Astrophil
Thu Jan 16, 2020 5:56 pm
Forum: This is SolarChat !!
Topic: Full/Partial disk 2020-01-16
Replies: 8
Views: 134

Re: Full/Partial disk 2020-01-16

Fine images, Jochen. Seeing is not so important when there is not much to see. Looking forward to more activity.

Phil
by Astrophil
Thu Jan 16, 2020 5:52 pm
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 202

Re: Jan 13, 2020 FDs +

Thank you all for the kind comments!

Phil
by Astrophil
Thu Jan 16, 2020 5:47 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 18
Views: 364

Tuning or bandwidth?

We all strive to produce the best images from the equipment we have available to us. However, some images appear better than others. Putting resolution aside, my rudimentary knowledge of solar imaging leads me to the question of whether proper etalon tuning or system bandwidth is of primarily import...
by Astrophil
Tue Jan 14, 2020 2:47 pm
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 202

Re: Jan 13, 2020 FDs +

Thanks for the kind comments and encouragement. Much appreciated. Rainer, I agree that tuning could use a little adjusting. With the pressure tuning controls it seems I get tired of turning the knobs berore it gets tuned properly. I will persevere. Alexandra, I have never noticed a bandwidth issue i...
by Astrophil
Tue Jan 14, 2020 2:07 am
Forum: This is SolarChat !!
Topic: Full Disc 13 January 2020
Replies: 9
Views: 143

Re: Full Disc 13 January 2020

Rainer, that's another great mosaic. Well done.

Phil
by Astrophil
Tue Jan 14, 2020 2:05 am
Forum: This is SolarChat !!
Topic: Sol from the 13th of January 2020.
Replies: 8
Views: 115

Re: Sol from the 13th of January 2020.

Super disks and great proms, Eric.

Phil