17th Feb Ha Sun

[Maurice]

Hi


Ha sun from Melbourne this afternoon.


Imaged with a home made spectroheliograph and 100mm f/9 ED refractor.
Best 14 of 32 reconstructed scans selected and stacked in AutoStakkert3!
Sharpened in Astrosurface.


Seeling was only average for these data.
Compressed image attached here.


Better one here: https://flic.kr/p/2qMdHHc


cheers
Maurice

[Peter Ward]

Now that I've has some first hand experience in using a SHG, the
appreciation of just how much craftsmanship is required to produce
a SHG image like this is significant.

Wonderful stuff

My new QHY IMX678 based camera arrived today.....if it produces data that is
of similar calibre (i.e. awesome ) I'll be over the moon. :)

Again, excellent stuff Maurice. :thumbsup::thumbsup:

[Saturnine]

Excellent image Maurice, I really like the way that the spectoheliograph contrasts the filaments and active areas.

[Maurice]

Thanks Peter..
I've just seen your most recent SHG effort & it looks great.
You have taken leaps forward in just a few days.. well done.




Cheers Jeff.

The contrast is due to the extremely narrow wavelength range sampled by the SHG. With a 2400l/mm grating and say a 200mm fl collimating lens its about 0.05A/pixel. Far narrower than your average Etalon offers..