CaK from the 27th and MiniSHG H alpha 28th Oct

[Merlin66]

27/10 First day without cloud/ wind etc.
Managed a set of CaK with the Vixen 90M.
The current activity is impressive, some six numbered AR's visible
The Raben map shows them all.

AR 2887 is very photogenic! A prominent sunspot with umbra/ penumbra and a "family" of smaller spots and faculae following behind.
The new AR 2891 in the north looks very promising.
All it all a great time for solar observers.

115521.jpg (96.74 KiB) Viewed 250 times

Capture.JPG (71.88 KiB) Viewed 250 times

115842.jpg (309.73 KiB) Viewed 250 times

120040.jpg (658.64 KiB) Viewed 250 times

120250.jpg (321.71 KiB) Viewed 250 times

28/10 Modifying the MiniSHG to improve the optics. A 9sec scan in H alpha...

113453.jpg (187.17 KiB) Viewed 250 times

113453_prom.jpg (120.38 KiB) Viewed 250 times

114411_crop1.jpg (163.33 KiB) Viewed 248 times

114411_crop2.jpg (225.44 KiB) Viewed 248 times

The performance definitely seems to reflect the quality of the optics used.
The jump from a $2 Surplus Shed achromat to a $75 Shelyak "custom designed" achromat, although costly, showed immediately an improved outcome.
Re-building the collimator and testing the focus/ infinity focus on the slit plate, is a bit fiddly, but I'm sure will be worth the effort.

[DeepSolar64]

CaK shows up plage/faculae better than white light does, especially away from the limb. The MiniSHG does quite well in Ha!

Thanks for sharing.

James

[marktownley]

That Ha full disk is the business Ken!

[Montana]

Superb CaK and the SHG image is your best ever, both clear and detailed, fabulous!!

Alexandra

[Merlin66]

Thanks guys,
appreciated!

[ffellah]

A great set at both lights, Ken

Franco

[eroel]

Ken:
Super CaK images, thanks for sharing them.
Best wishes.
Eric.

[arnedanielsen]

Beautiful collection of images!

Best regards,
Arne

[Merlin66]

Thanks for the feedback, always appreciated.
My next challenge is to go for the Helium D3.