31.7.20

31.07.2020 Two ARs in poor seing conditions.

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Friday 31st 56F. 7am. A cool, bright start with almost no cloud. I am watching the observatory from my indoor, "computer" window for the sun to hit to the dome. We have a low hill to our east and several, largely unmanaged hedges. Which rather impedes a really early start.


 I shall be out there as soon as my first cup of tea has gone down. Two spots and assorted proms are competing for attention. The proms need the PST BF. While the surface features want the Lunt
 B1200.

It is a matter of gain. The PST BF is almost transparent compared to the B1200. So the small boost in gain, which required to expose the proms, is far easier with the PST blocking filter. 

7.40 58/55F. Still bright and clear as the seeing settles. Mushy at first with thermal agitation. Cleared slightly but to more serious agitation. A white block appears to be sitting beside AR2767. It is reducing and moving NE as far as I can tell in these dreadful seeing conditions.

08.30 First clouds racing across the sun. The seeing is still mush and highly agitated. Now there's a large, dark patch near the NE limb. It is persevering but I can't get a better image.

A solitary vapour trail has appeared quite low in the south east.




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