H-alpha SHG from Oct 18 -- a stacked hemisphere

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thesmiths
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H-alpha SHG from Oct 18 -- a stacked hemisphere

Post by thesmiths »

I made the best use I could of the window of time from 11:00 am to 11:40am when the Sun was visible from my balcony. The sky was quite clear, though conditions were a bit windy. The wind can cause the mount to vibrate and create scan disturbances. I was able to take a lot of scans but many seemed to have narrow segments of the scan that were "blurred", most likely from the wind vibration.

The imaging setup was the same as the previous post from Oct 16 viewtopic.php?t=38464. The image below is a stack of 12 manually selected frames from a total of 24 (AS!3, ImPPG, Photoshop Elements). I used Tilting Sun to determine that the solar equator was 26 degrees rotated. I rotated the image in Photoshop by 30 degrees (it looked a little better than 26). The southern hemisphere seems to be where all the action is at the moment so although I did a full disk scan, I only present here the southern part. Click on the image to see at higher resolution.

H-alpha SHG. Stack of 12 frames. Oct 18, 10:04 UTC to 10:12 UTC.
H-alpha SHG. Stack of 12 frames. Oct 18, 10:04 UTC to 10:12 UTC.
181022-Ha-2-720mm-stack-12.jpg (992.9 KiB) Viewed 973 times

I include below a photo of the current spectrometer setup, with the new lens on the 183MM camera. The collimator lens is 135mm f3.5 and the camera lens is 150mm f4, both Asahi Pentax Super-Takumar M42 SLR lenses. I recently eliminated the tilt adjustment in front of the slit; it turned out the problem was with the positioning of the diffraction grating. The electronic focuser on the refractor telescope has turned out to be extremely useful. The blue and red markings on the 2400 l/mm holographic grating indicate the positions for H-alpha and Ca-K/H (currently set for H-alpha). The white tape has markings to show the correct lens focus at H-alpha. Some small focus adjustments are typically necessary when imaging near 400nm.

Closeup view of the SHG spectrometer.
Closeup view of the SHG spectrometer.
1573.jpg (403.85 KiB) Viewed 973 times
Last edited by thesmiths on Tue Oct 18, 2022 5:26 pm, edited 4 times in total.


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Re: H-alpha SHG from Oct 18 -- a stacked hemisphere

Post by Montana »

Always such a delight to view :bow :hamster:

Alexandra


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Re: H-alpha SHG from Oct 18 -- a stacked hemisphere

Post by marktownley »

Delightful indeed! I can't wait to get into this when I retire.


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Re: H-alpha SHG from Oct 18 -- a stacked hemisphere

Post by Alun_H »

Superb image Douglas.

Alun


Lunt 50THa solar scope
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here! :lol:
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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