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All observing logs that mention sunspot 904

2006-08-21


Location: Billingborough (South Lincolnshire, UK)
From: 2006-08-21 13:50 UT
To: 2006-08-21 13:55 UT
Equipment: Solarscope
Temperature: 20.3C ...
Dew Point: 13.2C ...
Humidity: 63% ...
Wind Speed: 3.5mph ...
Wind Dir: West North West ...
Pressure: 1012.3hPa ...
Notes:

Mostly cloudy day with a fair bit of wind. During a reasonable break in the clouds I took the Solarscope out to do a quick sunspot count.

Sun

From: 2006-08-21 13:50 UT
To: 2006-08-21 13:55 UT

The count was quite tricky today due to the wind blowing the Solarscope about. However, despite this, I could see a single large spot in active area 904. No detail could be seen, possibly due to the conditions but mostly down to it being very close to the limb (I expect that it won't be visible tomorrow).

A short while later I noticed what appeared to be another spot on the opposite limb. Because it looked like there was a small, shallow "bite" out of the limb I first took it to be an obstruction in the Solarscope somewhere. I rotated the tube and moved things about a little but it stayed in the same place suggesting that it really was a new spot, right on the limb.

I then checked online and a couple of space weather sites had evidence of it but no ID was noted (in fact, SpaceWeather.com were showing it with a question mark against it).

Some time later I found out that it had been given the ID 905.


2006-08-16


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

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.

Sun

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


2006-08-15


Location: Billingborough (South Lincolnshire, UK)
From: 2006-08-15 16:10 UT
To: 2006-08-15 16:15 UT
Equipment: Solarscope
Temperature: 19.3C ...
Dew Point: 11.6C ...
Humidity: 61% ...
Wind Speed: Calm ...
Pressure: 1001.2hPa ...
Notes:

Another very cloudy day, overcast for most of it. Late on in the afternoon there was a brief break in the cloud so took the Solarscope out to do a quick sunspot count.

Sun

From: 2006-08-15 16:10 UT
To: 2006-08-15 16:15 UT

Conditions were pretty bad (although not quite as bad as yesterday) but briefly clear enough that a view with the Solarscope was possible. Right away I could see active area 904. The main feature of the area was a very large spot that had a very dark umbra. Its penumbra was also very impressive with some detail in it visible — its outer edge also seemed to be quite dark and very well defined.

Close by was a pair of very dark spots which appeared to be sharing a common penumbra. Both of them also had a very dark looking umbra.

As well as the three big spots I could also make out three smaller spots close by.

Because the area was so impressive I went inside to get a pencil and some paper so that I could make a sketch but, by the time I got back outside, the gap in the clouds had passed and there was no sign of another gap coming up. Also, because of this, I never got to try another naked-eye view.


2006-08-14


Location: Billingborough (South Lincolnshire, UK)
From: 2006-08-14 16:05 UT
To: 2006-08-14 16:10 UT
Equipment: Naked Eye
Temperature: 17.3C ...
Dew Point: 12.0C ...
Humidity: 71% ...
Wind Speed: Calm ...
Pressure: 1009.0hPa ...
Notes:

Very cloudy day, overcast for most of it. Late on in the afternoon there was a brief break in the cloud so I headed out with a pair of eclipse shades to see if I could see the large sunspots that are currently part of active area 904.

Sun

From: 2006-08-14 16:05 UT
To: 2006-08-14 16:10 UT

Conditions were pretty terrible (hence the reason I didn't get the Solarscope out to do a sunspot count). Although I did have a short break in the clouds the sky that was clear was still very hazy. Despite this, using a pair of eclipse shades, I could just make out the biggest sunspot associated with active area 904. This is the first naked-eye sunspot I've seen for some time.


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