A second view of the Great Spot. This time a spectral series through the CaH spectral line (Blue to red is upper left to lower right and I have yet to calibrate the step size.)
An interesting observation: What I thought was a light bridge in the spot centre becomes much brighter near line centre, indicating more of a chromospheric nature to this feature, suggesting it exists high in the solar atmosphere. I was under the impression that light bridges were photospheric.
Cheers.
Peter.
SHG 1st light of 2016: AR12529 in Ca H
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Re: SHG 1st light of 2016: AR12529 in Ca H
Thanks Peter
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Re: SHG 1st light of 2016: AR12529 in Ca H
This is a lovely sweep Peter! When I was using the CaH Quark I also found the plage got dimmer as you tuned either side of the centre line, your images show it very well. This spot seems to have quite a quite a few of the floating tendrils. Here's a shot I took yesterday in CaK that shows it.

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Re: SHG 1st light of 2016: AR12529 in Ca H
Really interesting!
It show that SHG can really make science even on a amateur level!
It show that SHG can really make science even on a amateur level!
Re: SHG 1st light of 2016: AR12529 in Ca H
ill second that statement
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Re: SHG 1st light of 2016: AR12529 in Ca H
Thanks, Everyone!
Thanks for the image, Mark. So, I guess we're observing these chromospheric tendrils rather than a photospheric lightbridge.
Cheers.
Peter.
Thanks for the image, Mark. So, I guess we're observing these chromospheric tendrils rather than a photospheric lightbridge.
Cheers.
Peter.
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Re: SHG 1st light of 2016: AR12529 in Ca H
Superb images Peter
I have definitely seen light bridges in Halpha, CaK and WL
Alexandra



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