Spectroheliograms for 13th Mar 2023

[Alun_H]

Got a few breaks in the clouds mid afternoon today so took the chance on running off a couple of scans in the Calcium K and Hydrogen Alpha wavelengths using my 72ED and Sol'Ex with QHY5III 178M,16x sidereal speed used on CEM60 to force the scans,reconstructed in SHG_MAIN ver3.7,these are single scans with no processing apart from resizing and horizontal flipping (north towards the top right hand corner). The scope was reduced to 40mm f/10.5 for the calcium K line scan.

Alun

CaK-scan-15_37_UT-20230313.jpg (232.1 KiB) Viewed 1108 times

Ha_14_28_UT-20230313.jpg (249.46 KiB) Viewed 1108 times

[thesmiths]

It's always nice to have sufficient time to do two wavelengths. The H-alpha looks a little noisy -- did you need to set the gain quite high?

[Alun_H]

I tried to keep the gain low but once again because of the clouds I had to rush,,there were clouds drifting across the Ha as I recorded the scan. here is a single frame from the Ha line recording along with the CaK..Looking at the Ha I think I had too low an exposure time as the fine line beneath is still visible.

Ha-Scan-20230313.jpg (52.07 KiB) Viewed 1094 times

Ha

CaK-20230313.jpg (55.87 KiB) Viewed 1094 times

CaK

Alun

[Montana]

These are incredible Alun, it is such a joy to see these images from the SHG, they are a world apart from what is seen with a regular filter

Alexandra

[marktownley]

These are excellent ALun!

[Alun_H]

Thank you Alexandra,Mark for the kind words.

Alun