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CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

AR 14079's journey from the 29th April until today the 10th May.

Started by steveward53 , May 10 2025 02:08 PM

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8 replies to this topic

#1 steveward53

Skylab

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Loc: Newmarket,UK

Posted 10 May 2025 - 02:08 PM

Interesting to see how it expanded and then contracted again and ended up looking remarkably similar to how it first appeared.

_{Scaled down to about 10% of original ...}

Edited by steveward53, 10 May 2025 - 02:22 PM.

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#2 Jim Waters

Voyager 1

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Joined: 21 Oct 2007
Loc: Phoenix, AZ USA

Posted 10 May 2025 - 02:53 PM

Nice works Steve.

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#3 groom

Apollo

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Joined: 26 Apr 2018

Posted 10 May 2025 - 05:45 PM

Nice collection of images; this looks to be an example of the Wilson effect, discussed at pp 41-43 of Jenkins's book "Observing the Sun", caused by geometric perspective foreshortening.

Edited by groom, 10 May 2025 - 05:46 PM.

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#4 steveward53

Skylab

topic starter

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Loc: Newmarket,UK

Posted 10 May 2025 - 11:52 PM

Nice collection of images; this looks to be an example of the Wilson effect, discussed at pp 41-43 of Jenkins's book "Observing the Sun", caused by geometric perspective foreshortening.

Well aware of the Wilson effect thanks , whilst the main 'spot' in the AR remained largely consistent over the transit and shows the effect as expected as it left one limb and then approached the other it was the more unstable area to the left of the region that expanded and then fizzled out.