Search found 350 matches

by yltansg
Thu Jan 21, 2021 9:11 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

20Jan21. These new sunspots, imaged in Calcium-K wavelength have been shooting out C-class flares and getting increasingly interesting to observe: https://1.bp.blogspot.com/-XRCJWnu8hV8/YAkQWfTtwTI/AAAAAAAAtVg/W1TIhncvCwc7zMSQFKRx_ieg5zNY9xfLgCLcBGAsYHQ/s1703/20Jan%2B08_51am%2BC11_CAK2797.tif Alfred
by yltansg
Sat Jan 16, 2021 8:22 am
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

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: https://1.bp.blogspot.com/-njwkvpGEEGo/YAIwLcTUXbI/AAAAAAAAtRM/WCbNPmPPVnkhHWTepCcwdR2vkQfKT9NVgCLcBGAsYHQ/w640-h640/latest_1024_1700.jpg Under a 11" apertur...
by yltansg
Thu Dec 24, 2020 5:40 am
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

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...
by yltansg
Wed Dec 23, 2020 1:31 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

Here is today's (23 Dec) high-resolution CAK image of AR12794: https://1.bp.blogspot.com/-kBtgwSmzWUk/X-LSBLQyM8I/AAAAAAAAs1E/YIwQ8DEYCQETuDTeKP2aySkxsFjJOpD4wCLcBGAsYHQ/s1960/084744%2B100f11crNI2lvl198_90lk.jpg AR12794 has moved further away from the eastern limbs today. Another new AR, smaller tho...
by yltansg
Wed Dec 23, 2020 12:18 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

Mr Chia and all who observe/image the Sun. This was from 22 Dec, 08:55am, looking at Sunspot AR12794 in Calcium-K wavelength from extreme violet light emitted by ionised hydrogen in the lower chromosphere: https://1.bp.blogspot.com/--0GJVk5WYK4/X-HwCCwta6I/AAAAAAAAs0Y/1LdLrZV-I5cyBzRttZOtM7l2d5rKqkv...
by yltansg
Fri Dec 18, 2020 8:14 am
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

Hi Mr Chia, Thanks for a concise report. Yesterday, the seeing condition was too poor for high-resolution imaging. The lack of large sunspots was the other reason I didn't get to observe the Sun. I am looking forward to seeing the active region that will probably be visible in 2-3 days time as shown...
by yltansg
Sat Dec 12, 2020 7:02 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

Did some H-Alpha and Calcium-K imaging on 11 Dec. AR 2790 in H-Alpha https://1.bp.blogspot.com/-dEhyVTjZUq0/X9OMH3cLj6I/AAAAAAAAsnc/5MNt4YOpS-QRw793cHWkMfy-M9MCx1oDACLcBGAsYHQ/s1894/081050%2B200f5ligicrNI4mk.jpg https://1.bp.blogspot.com/-8LIpdQeXKUg/X9OIw2NLgEI/AAAAAAAAsm0/M3ts-tpAvMc5-nY7fOkCxyETp...
by yltansg
Thu Dec 03, 2020 8:26 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

Another addition from 3 Dec imaging session this morning, a close-up photo of active region 2786 in hydrogen-alpha wavelength: https://1.bp.blogspot.com/-_BTSkgQQOnw/X8h8T7lXi4I/AAAAAAAAsVY/DTG1FivZHMAm_lTwc1tvkmUWkJZaQfhVQCLcBGAsYHQ/s1905/080818%2B200f10icrlvlmk.jpg I received the following comment...
by yltansg
Thu Dec 03, 2020 1:40 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

3Dec - Red light from Active Region 2790. About 2-3 times the size of Earth. It started with a big bang on 29 Nov but has quietened down. https://1.bp.blogspot.com/-t4zha7PmKA0/X8h1VrG29-I/AAAAAAAAsVM/ozK-Aua4WqQ8NCv0008yQeJWEE6V0uP5wCLcBGAsYHQ/s1283/082004%2B200F10icrNI4TPsh10Gradlvl074lkcr.jpg Wor...
by yltansg
Wed Dec 02, 2020 9:25 pm
Forum: Astronomy Events & Observation Sessions
Topic: Solar cycle 25
Replies: 63
Views: 2538

Re: Solar cycle 25

https://1.bp.blogspot.com/-e9SfO29FC6o/X8ZggXnEKaI/AAAAAAAAsUA/CC4IEO3x9J4jYRit18ioQsmCqWws1gSmQCLcBGAsYHQ/s1911/080242%2B35f2crliglvl1_11mkNI4TPfoc25_25Gr2.jpg On 1 Dec 2020, I also took a photo of the same sunspot in Calcium-K wavelength looking at the light from calcium atoms in the lower chromo...