August 23, 2021: Second try with the Tri-Band SCT

[michael.h.f.wilkinson]

Went home a bit early from work to make use of today's clear, if hazy skies. First go in WL, where I noticed FireCapture refused to talk to the new ASI294MM, but did want to talk to the ASI183MM. Not sure why, but the image size might be beyond the capacity of FireCapture. Even with the ASI183MM, I decided to select an ROI around the big AR.

Could only stack 200 out of 2000 frames, and I am not quite sure I nailed focus, but here goes:

In Ca-K seeing was predictably worse, but I am not too disappointed, and I could stack 500 out of 2000 frames.

Grey scale:

Pseudo colour:

H-alpha was taken with the ASI174MM at F/30, so a small 5-pane mosaic was called for:

Grey scale:

Pseudo colour:

Even an arbitrary piece of solar surface becomes fascinating at this resolution:

 

Clearly, H-alpha comes out best, and I am still waiting for a day with really good seeing, but I am getting the hang of this instrument

[Pete Presland]

Lovely images, fine level of details.