In This is Solarchat I posted a mosaic of these three wavelengths: viewtopic.php?t=40803. I will post the individual images here. 106mm aperture, 720mm focal length telescope. The Ca-H image was done with a 72mm aperture mask (and probably the H-beta might have benefited from a 90mm mask). ZWO 183MM camera under FireCapture, AS!3, ImPPG, Photoshop Elements. All scans were done in the DEC direction with an ROI length of 3304 pixels; width 120 pixels for Ca-H, 100 pixels for H-alpha, 70 pixels for H-beta -- the width of the ROI depended on the width of the spectral line. The narrower the ROI, the higher the fps the camera can output and therefore the higher the scan rate and shorter the acquisition time.
H-alpha, stack of 16 scans. Exposure 2ms, gain zero, 386fps.
H-beta, stack of 12 scans. Exposure 0.8ms, gain zero, 479fps.
Ca-H, stack of 9 scans. Exposure 3ms, gain 13%, 318fps.
Ca-H SHG data reprocessed to bring out the Calcium prominences. There is good correspondence with the H-alpha prominences (see inverted H-alpha image below)
H-alpha, H-beta and CaH SHG images from May 21
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Re: H-alpha, H-beta and CaH SHG images from May 21
Hi Doug,
Astonishing SHG images. They look like if they were made with etalons of normal filters but not with a Spectroheliograph.
Very well done. I have been clouded out since several days but had time to finally finish the braking system of my Land Rover and it is working as it should work.
Astonishing SHG images. They look like if they were made with etalons of normal filters but not with a Spectroheliograph.
Very well done. I have been clouded out since several days but had time to finally finish the braking system of my Land Rover and it is working as it should work.
regards Rainer
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Re: H-alpha, H-beta and CaH SHG images from May 21
Oh my!!! these are delicious, I can't work out whether Hbeta or CaH is my favourite what a box of chocolates!
Alexandra
Alexandra