I was checking arxiv.org today and if I'm not mistaken, the outflow around a sunspot's penumbra (granules spreading outward over a limited range from the penumbra), something I noticed back in 2012 in my WL animations, e.g. here:
is probably what is called the moat flow. A sample paper: Correlations between sunspots and their moat flows. The horizontal velocity given (~1000 m/s) seems fitting ‒ over a few tens of minutes it would amount to a few thousand km, i.e. a few granule widths, more or less what the animation shows.
(Not to be confused with Evershed flow, which occurs in penumbra.)
Moat flow
- GreatAttractor
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Re: Moat flow
Thanks fo this. Superb animation and interesting article
Robert
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Re: Moat flow
Great animation and interesting stuff!
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Re: Moat flow
Oh is that what it is called, I see that in all my WL animations too and the granulation cells are also slightly brighter than all the rest too, a bit like a halo round the spot.
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Re: Moat flow
Very interesting. Thanks for that.
Stu.
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