Solar cycle 25

Alright, this is for sharing of your observation experience. Or, if you are arranging gatherings, star-gazing expeditions or just want some company to go observing together, you can shout it out here.
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yltansg
Posts: 350
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

superiorstream wrote:
Thu Dec 24, 2020 2:13 am
Hi Alfred and all solar observer

In Cak..... 2 regions glowing with crack like structure..... One at 2793 region, rotating out of view and another at 2794. The one at 2794 has 2 brighter patch., one of which is responsible for yesterday's Cak prominence.

Alfred photo is a very good close up of 2794. It's also interesting that in the 2nd photo, the new sunspot shows up. Will be looking for that tomorrow, weather permitting. Thanks for sharing the photos.
Hi Mr Chia and solar observers, here is another view of AR2794 taken on 23 Dec, 9am. I am testing a SCT corrector. The results look promising. The penumbra fibrils are starting to resolve nicely. This is the first time I have achieved such resolution. Thanks to a friend living in naperville, illinois,:

Image

Let us look at the full solar disk to appreciate the zoom-in image:
Image

superiorstream
Posts: 1232
Joined: Mon Nov 03, 2008 4:45 pm

Re: Solar cycle 25

Post by superiorstream »

Hi Alfred and all interested in solar
A comparison of obs in 25,27,28 Dec 2020
In 540nm...... 2794,2795 visible.
2794 has a comma type umbra that eventually shorten its tail till dec 28 it become a small sharp end.
2795 is more interesting. The bigger spot first show up as a umbra with 2 black patch., then grow to 3 patch and on 28 dec split to 4,one above the other...... a real interesting umbra. The penumbra is wider at the top and narrow downat the bottom. The other spot initially has a single core but by 28 dec split into two., surrounded by a penumbra.
In cak..... For all 3 days, 2,794 and 2795 together ic surrounded by glowing 'cracks' that stretch more than 500,000km......half to 1/3 the length of the southern belt.
In Ha..... Same active regions as in cak but different combinations of filaments every day.
Prominence also visible at edge changing profile daily.
As for the northern belt, at least 2 filaments and a daily change of prominence profile.

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yltansg
Posts: 350
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

Dear Mr Chia and solar enthusiasts,

We saw the Sun yesterday after a long time. The solar disk in Calcium-K (from SDO) was rather featureless:

Image

Under a 11" aperture SCT, fitted with necessary energy rejection and CAK filters the zoom-in picture of the bright spots showed super granulations, areas of intense magnetic field concentration. Don't think there will be much eruptive actions till mid of next week where a large active region is coming in the Southern hemisphere.

Image

Please do a click-right and click on the "+" magnifier to see the image with CAK grains in its full resolution.

Alfred

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yltansg
Posts: 350
Joined: Mon Aug 31, 2009 3:35 pm
Favourite scope: Borg 76 + Solar Scope SF50
Location: Bukit Batok

Re: Solar cycle 25

Post by yltansg »

20Jan21. These new sunspots, imaged in Calcium-K wavelength have been shooting out C-class flares and getting increasingly interesting to observe:

Image

Alfred

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