ok helium D3 line -- your kidding right

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highfnum
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ok helium D3 line -- your kidding right

Post by highfnum » Sun Apr 17, 2016 1:37 pm

I used "atlas of the solar spectrum from 3000 to 1000" by L. Delbouille
to pick out Helium D3 line
you guys gotta be kidding me - is that all the signal strength :shock:
I used 2400lpmm grating - moment big spot crossed spectrum i marked with red tick

plz verify if you can
heliumd3withspot.JPG
heliumd3withspot.JPG (17.22 KiB) Viewed 735 times

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p_zetner
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Re: ok helium D3 line -- your kidding right

Post by p_zetner » Mon Apr 18, 2016 3:11 am

Here is a quote from one of my earlier posts.

http://solarchat.natca.net/viewtopic.ph ... 30#p124030

"The He disk is difficult. You can see this spectral region become bright at the limb so you can zoom in on the D3 line fairly easily."

Here is a video frame near the limb:
HeD3 Limb feature.jpg
HeD3 Limb feature.jpg (77.23 KiB) Viewed 722 times
"My technique is to make a series of SHG images at different wavelengths near D3. To see the absorbing plage regions, I subtract, from this series, an image made from the continuum nearby and process the result. It's a bit of trial and error to find the best continuum image to subtract. Also, I think the professionals divide out the continuum, rather than subtract, but I've had no success doing this. With my instrument and processing, I usually have a series of about 5 images which show the He D3 features (a wavelength span of about 0.3 Angstroms). I choose the best one to tweak."

highfnum
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Re: ok helium D3 line -- your kidding right

Post by highfnum » Mon Apr 18, 2016 8:40 pm

thx Peter for reply
and your pic is worth a thousand words
will try at some point to replicate glow

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