Thread: AR 2738 19 April Ha wings and CaK
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Old 19-04-2019, 04:40 PM
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Merlin66 (Ken)
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Location: Junortoun Vic
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AR 2738 19 April Ha wings and CaK
A few images....
The colorized CaK images show the shape of the major AR 2738 spot (and the following AR2739 group) BUT I'm not convinced that it shows the Wilson effect! It appears to me that the trailing penumbra (towards the sun's centre is actually wider than the section close to the edge - the opposite of the Wilson effect.
The next image in the Blue wing shows once again the extent of the spot - you decide: which penumbral section is wider?
The last image in the red wing shows the typical Ha filigree and magnetic swirls..Oh...and the local prom.

ED80/ SM60, PST Mod x2.5PM, ASI 174

(It's good to see the PST DS working well and suppressing the Photospheric sharp edge - just the blended spiculation)
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Last edited by Merlin66; 19-04-2019 at 05:02 PM.
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