Observing Log for 2006-08-16

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Location: Billingborough (South Lincolnshire, UK)
From: 2006-08-16 13:10 UT
To: 2006-08-16 13:25 UT
Equipment: Naked Eye
Temperature: 24.9C ...
Dew Point: 11.7C ...
Humidity: 44% ...
Wind Speed: 2.2mph ...
Wind Dir: South South East ...
Pressure: 999.9hPa ...

Quite a cloudy afternoon but with some gaps. During one gap I took the Solarscope out to do a quick sunspot count and, more to the point, to observe active area 904.


From: 2006-08-16 13:10 UT
To: 2006-08-16 13:25 UT

I started by having a look at the Sun with the naked eye and a pair of eclipse shades. I could see the largest spot in active area 904 with no trouble at all.

Next I pointed the Solarscope at the Sun. At first glance the area didn't look too different from yesterday. The biggest spot still had an impressively dark umbra and a nicely defined penumbra. Close by I could see a single, very faint spot-like mark — I didn't count this as a spot.

The smaller pair of spots that I noted yesterday appeared to be a pair of pairs today (perhaps they were yesterday but the viewing conditions made it impossible for me to tell?). Each pair appeared to have a common penumbra and the penumbras of those pairs appeared to be joined.

I quickly made the following sketch of the Sun in general:

The Sun

I then attempted to sketch AA904 in a little more detail:

Active Area 904

Page last modified: 2013-04-09 09:19:19 UT
Dave Pearson <davep@davep.org>
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