Search found 428 matches
- Sat Oct 09, 2021 9:31 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
8 Oct 21, A survey in Calcium-K wavelength. AR2882 started as a stable Active Region, after discharging a few C-Class flares this week has evolved into a restless AR with 'beta-gamma' magnetic field with energy for M-Class flares. This is an image from Solar Dynamic Observatory: https://blogger.goog...
- Wed Oct 06, 2021 10:28 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
Hi Vernonfarmer39,
I also have other setups for Calcium-K and other image scale captures: https://www.epj-conferences.org/article ... _01002.pdf
Alfred
I also have other setups for Calcium-K and other image scale captures: https://www.epj-conferences.org/article ... _01002.pdf
Alfred
- Fri Sep 24, 2021 7:55 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
Adding a pseudo-coloured image of AR2871:
Cheers.
Alfred
Cheers.
Alfred
- Fri Sep 24, 2021 7:22 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
Old sunspot AR2860 is returning after a 2-week transit around the far side of the sun. Per tradition, it has been renumbered AR2871. It has returned after a two-week trip around the farside of the sun. During its previous appearance in late August, the sunspot produced 1 M-class flare and 21 C-class...
- Sun Sep 19, 2021 8:57 am
- Forum: Buy and Sell
- Topic: WTB: ASI1600MM Pro (Found, Closed)
- Replies: 1
- Views: 3739
WTB: ASI1600MM Pro (Found, Closed)
Please let me know if you have one for sale.
Thanks.
Alfred
Thanks.
Alfred
- Tue Sep 14, 2021 9:08 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
Thanks, Mr Chia for your kind words. Here is another image from the same 11 Sep session. This is a close-up of AR2868:
Alfred
Alfred
- Mon Sep 13, 2021 10:00 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
This is a closer look at AR2866 on 11 Sep 21
Do a right click to see the image in its full resolution.
Alfred
Do a right click to see the image in its full resolution.
Alfred
- Mon Sep 13, 2021 6:23 pm
- Forum: Buy and Sell
- Topic: WTB : Star Book for Vixen Sphinx Deluxe SXD (Found!)
- Replies: 3
- Views: 4020
Re: WTB : Star Book for Vixen Sphinx Deluxe SXD
Found, Thanks.
- Mon Sep 13, 2021 10:36 am
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
Stunning full disc image of the Sun. Great shots! Thanks for your compliments, Warp 7. The posting at https://solarchatforum.com/viewtopic.php?f=4&t=33334 has attracted several positive comments and a Solar Picture of the Day https://1.bp.blogspot.com/-w0ONj68M5AE/YT6hLiiRebI/AAAAAAABHlg/MBLKLm...
- Sun Sep 12, 2021 7:39 pm
- Forum: Astronomy Events & Observation Sessions
- Topic: Solar cycle 25
- Replies: 163
- Views: 83305
Re: Solar cycle 25
This is the actual colour of the upper atmosphere of the Sun, illuminated by red light emitted by hydrogen atoms. I used a 656.28 nm hydrogen alpha etalon to filter out all the other light and capture the features lighted by the red light. https://1.bp.blogspot.com/-B7KIK6HI0NQ/YT3gVWs18KI/AAAAAAABH...