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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 398 matches

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: 18
Views: 255

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: 5
Views: 45

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: 4
Views: 52

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: 14
Views: 266

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: 14
Views: 266

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: 14
Views: 266

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: 14
Views: 266

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: 263

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: 149

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: 119

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: 166

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: 14
Views: 266

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: 166

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: 122

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: 99

Re: Sol from the 13th of January 2020.

Super disks and great proms, Eric.

Phil
by Astrophil
Tue Jan 14, 2020 2:02 am
Forum: This is SolarChat !!
Topic: Jan 13, 2020 FDs +
Replies: 15
Views: 166

Jan 13, 2020 FDs +

Although a little hazy and not much solar excitement, it was nice to get some sunshine. Images were taken with a LS 80 with and without a 5x Powermate and although the scope lacks the wow factor, it sure beats just staring at the Sun. Here's my take on the 13th of January. Phil 20200113_095628_fd_10...
by Astrophil
Sun Jan 12, 2020 12:45 am
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

Rainer, I suspect that your system has a narrower bandpass than the Lunt or I need to work on tuning mine better. Looking back to fila-prom images I've taken in the past, they were done using a 0.3A etalon double stacked with a Quark or PST. I will pursue this idea when the opportunity arises. Until...
by Astrophil
Sat Jan 11, 2020 8:08 pm
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

Thanks Rainer, helpful info.

Phil
by Astrophil
Sat Jan 11, 2020 12:48 am
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

Hi Rainer, Nice setup you have that works very well. I'm using a standard double stacked Lunt 80 pressure tuned scope. I record using a PGR camera in 8 bit data, converted to avi, AutoStakkert, Imppg, and tweak in an image processing program. My curiosity was whether you captured and processed at a ...
by Astrophil
Thu Jan 09, 2020 7:02 pm
Forum: This is SolarChat !!
Topic: Full Disc 08 January 2020
Replies: 24
Views: 273

Re: Full Disc 08 January 2020

Rainer,great detail even when reduced in size, impressive. The filaprom turned out well. I could not make it happen with my setup, any tips?

Phil
by Astrophil
Thu Jan 09, 2020 6:53 pm
Forum: This is SolarChat !!
Topic: Full Disk CaK/H-alpha 20200109
Replies: 12
Views: 198

Re: Full Disk CaK/H-alpha 20200109

Both images are really good. I like the way you add the proms to the disk.

Phil
by Astrophil
Thu Jan 09, 2020 6:44 pm
Forum: This is SolarChat !!
Topic: Jan. 7 and 8, 2020 LS80
Replies: 12
Views: 175

Re: Jan. 7 and 8, 2020 LS80

Thank you all for the nice comments. It's great when clear skies and activity coincide. I guess that I was on a roll Franco but the forecasts seem to be bringing that to an end. Alexandra, that was a beautifully deacriptive comment, made me smile, thanks. Good eyes and timing, James, the prom was sh...
by Astrophil
Thu Jan 09, 2020 3:21 am
Forum: This is SolarChat !!
Topic: Jan. 7 and 8, 2020 LS80
Replies: 12
Views: 175

Jan. 7 and 8, 2020 LS80

The solar scenery continues and skies are still clear. Here are captures from the 7th and 8th showing the progress of the regions of activity. AR12755 is still hanging in there as is the one that rounded the limb a couple days ago. Yesterday a bright spot developed in the NW quadrant and has intensi...
by Astrophil
Tue Jan 07, 2020 3:22 am
Forum: This is SolarChat !!
Topic: AR2755 2020/1/5
Replies: 12
Views: 178

Re: AR2755 2020/1/5

Beautiful image, Olivier, smooth detail.

Phil
by Astrophil
Tue Jan 07, 2020 3:18 am
Forum: This is SolarChat !!
Topic: Jan 5th in Ha
Replies: 13
Views: 169

Re: Jan 5th in Ha

Nice images Brian, and a lot of detail to be had in the close up mosaic. Glad the sun was shining on you.

Phil