[AZ-Observing] Re: Sun Spot

At 16:15 -0700 02/25/2004, Jones, Jack (AZ75) wrote:
>When observing sunspots, I notice that the longer one looks at the disk in a
>given session, the more spots appear that can be counted. So you say "Gee, I
>guess I just missed it the first time around..."
>
>This is due to at least 3 things:
>
>Seeing gets better
>It was in your blind spot
>Sunspot forms while you are observing
>
>I've seen extra ones appear even in the center of the disk and there's no
>way I could have missed them the first few times I scanned the area.
>
>How long does it take anyway (in minutes) for a sunspot to form, i.e. go
>from invisibility to sufficient size to see with a given aperture?
>
>How large a spot can be obscured by the usual bad seeing that suddenly laxes
>out?
>
>I'm using 125X, 80 mm full aperture, Baader film filter. Please do not refer
>me to some source, I just want to know if its a phenom you (solar observers
>on this list) ever noticed, frequently or infrequently, and have to watch
>out for.
>
>Jack

I have not noticed that visually, however I did see something 
interesting with a web cam while viewing sun spots. It was partly 
cloudy and as I was watching the image on my laptop, some clouds 
(thin at first) passed in front of the Sun. Suddenly I saw a couple 
of fainter spots. When the clouds cleared, the spots could not be 
seen. I played around with the gain settings and shutter speeds and 
was able to see them in the clear.

Jeff
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