Quite a surprise this morning with a beautiful blue sky start to the day. I was expecting cloud, which is what our weather reports over the weekend were forecasting. The air was so very clear, but the seeing was below par making close up views something of a challenge. For my WL images I used a Lacerta wedge fitted with a 430nm filter, which provides bright facula, but, more importantly (with safety ND filters removed) it provides very bright images enabling very fast shutter speeds (of the order of 50 micro seconds or less). This helps freeze the image, reducing the impact of turbulence. With Ha (on my 150mm mod) the shutter operates at typically 10-20 milliseconds giving more image blur. Anyhow here are my images:
First up is a Ca II K FD image in mono and colour:
20211006_CaK_FD by Stuart Green, on Flickr
20211006_CaK_FD_colour by Stuart Green, on Flickr
....and the same in Ha (Triple stack):
20211006_Ha_FD_Mono by Stuart Green, on Flickr
20211006_Ha_FD_colour by Stuart Green, on Flickr
Here's a closer view of the main active region (AR12882) on my 150mm mod:
20211006_Ha_AR2882_Mono by Stuart Green, on Flickr
20211006_Ha_AR2882_colour by Stuart Green, on Flickr
...and a prom on the north east limb:
20211006_Ha_Prom by Stuart Green, on Flickr
Finally AR12882 at 430 nm:
20211006_430nm_AR2882 by Stuart Green, on Flickr
I thought that was enough for one session and clouds started rolling in anyhow.
Thanks for looking.
Stu.
Sun in Ha, CaK and 'WL' 6th October 2021
- Carbon60
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Sun in Ha, CaK and 'WL' 6th October 2021
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
- Montana
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Re: Sun in Ha, CaK and 'WL' 6th October 2021
Wow!! what a cracking set Stuart, look at that penumbral ruff round 12882! it looks like a raised mound or lions mane
Alexandra
Alexandra