I’d like to share these spectacular images of our Sun, taken by Prasad Agrahar with his home-made spectroheliograph. 

His first image is at H-alpha (656 nm), second is at H-beta (486 nm), and the third is at Helium D3 (585 nm).

With this device, IIUC, he can make an image at just about any wavelength that makes it through the front lens of the optics. He posted this to the NCA email list.

DIY!!

Guy Brandenburg

Prasad wrote:

Here are three images of our Sun, taken on Thursday morning with my DIY spectroheliograph. The weather was quite windy, and the seeing was poor. 

The above is H-alpha with [sunspot groups] AR 4294 and 4296 dazzling. 

This is H-beta

And finally, 

The above image is (…) Helium-D3, the emission line at 5875A.

Thank you all.

Prasad

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