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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 1134 matches

by rsfoto
Tue Jan 21, 2020 11:32 pm
Forum: This is SolarChat !!
Topic: Full Disc 21 January 2020
Replies: 4
Views: 24

Full Disc 21 January 2020

Hi,

The Sun came out two days earlier then expected and so here the Full discs in H-alpha and White light

Thanks for looking

Mosaico_20200121_9Q_RE.jpg
Mosaico_20200121_9Q_RE.jpg (1.06 MiB) Viewed 24 times
Mosaico_20200121_4Q_RE.jpg
Mosaico_20200121_4Q_RE.jpg (1006.32 KiB) Viewed 24 times
by rsfoto
Tue Jan 21, 2020 5:26 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 14
Views: 243

Re: Tuning or bandwidth?

Hi Phil,

I am not an expert in all those technical explanations but when comparing images I put them together in one image and compare.

Left side Double stack and right side Single stack.

What I see is that DS has more visible plague then SS :roll:

DSvsSS_Phil.jpg
DSvsSS_Phil.jpg (325.42 KiB) Viewed 30 times
by rsfoto
Mon Jan 20, 2020 9:20 pm
Forum: This is SolarChat !!
Topic: Kanzelhoehe Solar Observatory
Replies: 4
Views: 91

Re: Kanzelhoehe Solar Observatory

Hi Mark,

Very interesting.

Have you taken a look into their Gallery = https://www.kso.ac.at/downloads/airplanes.php
by rsfoto
Sun Jan 19, 2020 7:31 pm
Forum: This is SolarChat !!
Topic: Sun and sea
Replies: 14
Views: 152

Re: Sun and sea

Hi Alexandra,

Very nice images. At first sight I wondered why is that Human just standing there until I read about him.
by rsfoto
Sun Jan 19, 2020 6:01 pm
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 116

Re: Full Disc 17 January 2020

Superb discs Rainer! :hamster: :bow I see the faculae of cycle 24 AR, it is probably very weak so fizzling out. I have a new challenge for you now, polar faculae at the north and south pole are only visible during solar minimum. I see some nice bright points at the north of your WL image and some i...
by rsfoto
Sun Jan 19, 2020 5:57 pm
Forum: This is SolarChat !!
Topic: Ha Full Disk & S6348 - 19th January
Replies: 15
Views: 111

Re: Ha Full Disk & S6348 - 19th January

Hi Mark,

Great shots. If one looks at the Magneotgram in SDO the polarity is according to cycle 25. negative / positive

latest_2048_HMIB.jpg
latest_2048_HMIB.jpg (1.58 MiB) Viewed 92 times
Rainer
by rsfoto
Sun Jan 19, 2020 4:06 pm
Forum: This is SolarChat !!
Topic: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K
Replies: 13
Views: 195

Re: Today's SUN (20200119) | TV101, LUNT60, LUNT60 Ca-K

Hi Pedro,

Great images. The spot which is better visible in Ca K seems to be another from cycle 25 if it is compared to the magnetogram from SDO. It has a neg / pos polarity which correspods to the new polarity for the northern hemisphere

:shock:
by rsfoto
Sun Jan 19, 2020 12:37 am
Forum: This is SolarChat !!
Topic: January 17th Session
Replies: 15
Views: 133

Re: January 17th Session

Hi Brian,

Very good and interesting your images.

Rainer
by rsfoto
Sat Jan 18, 2020 6:19 pm
Forum: This is SolarChat !!
Topic: FD and big prominence 18-01-2020
Replies: 9
Views: 108

Re: FD and big prominence 18-01-2020

Hi Salvo,

Very nice images. Especially that faint prominence

Rainer
by rsfoto
Fri Jan 17, 2020 9:55 pm
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 116

Re: Full Disc 17 January 2020

Hi,

A bit later here the White light image. The old cycle 24 spot is not very visible and perhaps due to the atmospheric conditions not being clear as usual. :?

Mosaico_20200117_4Q_ET.jpg
Mosaico_20200117_4Q_ET.jpg (1.04 MiB) Viewed 111 times
by rsfoto
Fri Jan 17, 2020 9:19 pm
Forum: This is SolarChat !!
Topic: Full Disc 17 January 2020
Replies: 11
Views: 116

Full Disc 17 January 2020

Hi,

Just enough time to get a session of 9 Avi with just 250 frames each. Clouds > free > Clouds :shock:

While writing this trying to get 4 Avi in White light :o

Mosaico_20200117_9Q_RE.jpg
Mosaico_20200117_9Q_RE.jpg (1.19 MiB) Viewed 116 times
by rsfoto
Fri Jan 17, 2020 3:53 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 14
Views: 243

Re: Tuning or bandwidth?

In my opinion Phil's images are better balanced and they better represent what is seen on the sun. They also consist more shades between the spiculaes (darkes bushes on the disk). Rainer's images looks too much contrasty - just like more wide etalons show in a telescope. The space between disk spic...
by rsfoto
Thu Jan 16, 2020 11:09 pm
Forum: This is SolarChat !!
Topic: Full Disc 16 January 2020
Replies: 8
Views: 102

Full Disc 16 January 2020

Hi,

Today it was even worse then yesterday. :cry:

Mosaico_20200116_9Q_REa.jpg
Mosaico_20200116_9Q_REa.jpg (1.06 MiB) Viewed 102 times
by rsfoto
Thu Jan 16, 2020 7:58 pm
Forum: This is SolarChat !!
Topic: Full/Partial disk 2020-01-16
Replies: 8
Views: 112

Re: Full/Partial disk 2020-01-16

So if would be nice if we could live in a place like the one that Rainer suggests. :D
¿ what do I need to move to the Atacama desert ?

:? :?: :?: :?: :?:
by rsfoto
Thu Jan 16, 2020 7:32 pm
Forum: This is SolarChat !!
Topic: Full Disc 15 January 2020
Replies: 10
Views: 117

Re: Full Disc 15 January 2020

Rainer: you are a magician ! You certainly are doing a magnificent job of full disks with the SM 60 double stacked. I wish I could do the same with my SM90 DS. The 90 is traditionally not easy to put in band due to the length of the scope: you need orangutan arms to tune the external etalon while y...
by rsfoto
Thu Jan 16, 2020 7:24 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 14
Views: 243

Re: Tuning or bandwidth?

Hi Phil, Look at the image below where I took your histogram and how I changed it. Red lines is your original image histogram and green is how I stretched it a bit. Just as an idea how stretching the histogram can also influence what we see as sharpness = contrast. 20200115_125713_fd_cm_et_histogram...
by rsfoto
Thu Jan 16, 2020 7:02 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 14
Views: 243

Re: Tuning or bandwidth?

Hi Phil, I hope you do not mind but I downloaded your B&W image and processed it a bit according to my taste. You have some residuals there in the histogram which makes your image a bit opaque as well as you can stretch it on the white side a bit more. OK, I have to be careful as monitor settings do...
by rsfoto
Thu Jan 16, 2020 6:47 pm
Forum: This is SolarChat !!
Topic: Tuning or bandwidth?
Replies: 14
Views: 243

Re: Tuning or bandwidth?

Hi Phil, Looking at your images and my limited knowledge i would say you are very close to both best parameters. Not being able to look by myself into that due to now having the scope present it is also difficult ot judge. As you said with a few iterations one tries tog et closer to that and as I ca...
by rsfoto
Thu Jan 16, 2020 4:16 pm
Forum: This is SolarChat !!
Topic: Sol from the 15th of January 2020.
Replies: 11
Views: 142

Re: Sol from the 15th of January 2020.

Hola Eric,

Muy bien, muy bien

saludos Rainer
by rsfoto
Thu Jan 16, 2020 3:52 pm
Forum: This is SolarChat !!
Topic: Full/Partial disk 2020-01-16
Replies: 8
Views: 112

Re: Full/Partial disk 2020-01-16

Hi Jochen,

The weather conditions change daily and so will our images. I see it when I assemble my mosaics of the Sun.

We need to move to the Atacama desert in Chile ...

Rainer
by rsfoto
Thu Jan 16, 2020 3:49 pm
Forum: This is SolarChat !!
Topic: Full Disc 15 January 2020
Replies: 10
Views: 117

Re: Full Disc 15 January 2020

Hi Rainer: very nice results in spite of the thin clouds. Are you still using the Daystar filter? If you are, which one ? Franco :bow Hi Franco, Sorry no. Both DayStar filters I bought in April 2018 has gone back to DayStar as both were blind. Everytime I read the word DayStar I get angry :lol: Tha...
by rsfoto
Wed Jan 15, 2020 10:24 pm
Forum: This is SolarChat !!
Topic: Full Disc 15 January 2020
Replies: 10
Views: 117

Full Disc 15 January 2020

Hi, High and thin clouds infront of the Sun but enough light so I thought to give it a try it and below the result. Sorry for the bad quality :oops: If yout ake a look at the SDO magnetogram image you can see in the northern hemisphere a cycle 24 and a cycle 25 spot. The most left one is cycle 25 :s...
by rsfoto
Wed Jan 15, 2020 6:03 pm
Forum: This is SolarChat !!
Topic: Full Disk and prominence 15/01/2020
Replies: 12
Views: 156

Re: Full Disk and prominence 15/01/2020

Hi Salvo,

Very nice images

Rainer
by rsfoto
Wed Jan 15, 2020 12:41 am
Forum: This is SolarChat !!
Topic: More Cycle 25 Activity - 14th January
Replies: 9
Views: 156

Re: More Cycle 25 Activity - 14th January

Quite possibly guys. Hi, Looks like cycle 25 as it is negative / positive in the northern hemisphere, because the old spot is negative Positive but it is in the southern hemisphere. OK, I do not know how exact the distribution is when being very near the Equator. :? https://sdo.gsfc.nasa.gov/assets...