Solar imaging artifact

[lukebl]

Can anyone explain if I can avoid this artifact?

This is a dual capture of the sun from yesterday: an avi with short exposures for the surface, and an avi with longer exposures for the prominences. Captured with Sharpcap using a QHY5-ii mono cam and a plain unmodded Coronado PST.

The capture of the prominences creates a horizontal bright line at the top and bottom of the sun. I'm assuming it's something to do with the grossly overexposed solar disk when capturing the prominences, and possibly unavoidable with this particular camera?

[Merlin66]

Luke,

Interesting....

I only use the ASI 174MM and the ASI 1600MM for solar imaging.

I work at unity gain for each camera and vary the exposures (surface/ proms)

I tried to find the gain settings for the QHY5L II but didn't find any definitive data.

Could it be related to your gain settings?

 

 

[Merlin66]

Luke,

Any update on this issue????

 

[Nigella Bryant]

I usually only take one image in sharpcap then stack in autostakker and bring out the proms and surface together in ImPPG. Image from 3rd August 2020.