Solar Activity 18th Aug

[Merlin66]

Now we're really in winter! This week is cold wet and windy.
Just before the weather hit managed to get some Ha and CaK images.
The AR2771 is more of a disturbance than a feature. If you look closely near the middle of the image you'll see a dark spot with a "ducks foot" filament structure....
Some interesting proms.
Enjoy!

[PeterM]

Wow, nice! Really like the 1st & 4th prom. What camera did you use on the proms Ken?

[AstroJunk]

Great results.

I've just popped out and had a squiz. AR2771 had developed into a lovely sunspot cluster. One for tomorrow!

[Merlin66]

Peter,
I'm using an ASI 1600MM for all my solar imaging at the moment.

[Merlin66]

According to the forecast, I'll be relying on others to do the imaging for the next few days.

[Foxinsox]

Ken,


Need to ask: How are the designations such as "AR2771" generated ?
and what does the "A R "stand for ?

I love your regular solar imaging threads

[Merlin66]

The AR stands for "Active Area" may be just a faculae bright area with/ without visible spot.
The numbers are designated by NOAA
https://www.swpc.noaa.gov/

and updated/ shown on SpaceWeatherLive

https://www.spaceweatherlive.com/en/solar-activity/sunspot-regions
See also:
https://hesperia.gsfc.nasa.gov/sftheory/questions.htm#AR_numbers

[Foxinsox]

Thankyou Ken

[Saturnine]

Another fine set of images, always a pleasure to see your Sols' , especially when the conditions up here are terrible.