hydrogen alpha - 0.0 angstroms

this is the main message area for anything solar :)
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Bruce Girrell
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Re: hydrogen alpha - 0.0 angstroms

Post by Bruce Girrell » Wed Jun 06, 2018 7:54 pm

That's fantastic!!!
Where did you get that?

Bruce Girrell
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Re: hydrogen alpha - 0.0 angstroms

Post by Bruce Girrell » Wed Jun 06, 2018 10:39 pm

They definitely had to work at it:
https://dubshen.astro.su.se/wiki/index.php/CRISP

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Montana
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Re: hydrogen alpha - 0.0 angstroms

Post by Montana » Thu Jun 07, 2018 7:01 am

They have amazing seeing conditions, I need to move there :)

Alexandra

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Valery
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Re: hydrogen alpha - 0.0 angstroms

Post by Valery » Thu Jun 07, 2018 1:37 pm

Montana wrote:
Thu Jun 07, 2018 7:01 am
They have amazing seeing conditions, I need to move there :)

Alexandra
This telescope vacuum tube and adaptive optics which uses real time wave front analyzer with closed loop. Therefore after the seeing reaches a certain level (say, 1,5") then the AO makes the image literally diffraction limited for such an aperture.
Without an AO you still need a lucky imaging technique (LIT). In general, if a local seeing is OK, then LIT can deliver the same level of detalization as an AO. LIT is a like "post-factum AO". If an AO corrects wave front defomations, the LIT just rejects too distorted image fragments.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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