Sunspot data for 27 December 2022 of period 2022Q4: (PREV DAY - NEXT DAY)
| Sun221227_1031UTC_sketch.jpg | Sun221227_1033UTC.jpg |
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 |  Click here for the sharpened image. |
Today we had a remarkable phenomenon: a band of small cumuli, perhaps 5 or 6 solar diameters high passed at a steady pace, carried by a 4Bft wind, in front of the observatory. Between this band and the zenith and between it and the horizon not a single other cloud could be seen (apart from some very thin stratus). It took about 45 minutes for the clouds to pass, it was like waiting for a long train.... But finally, after the last wagon had passed, I managed to do the observation just before a large field of 90% cumuli arrived. Transparency was reasonable, and the scintillation monitor reported excellent seeing on average. I made the following observation:
Observation date/time: 27 December 10:31 UTC Telescope: GTT60 (Galileo Type Telescope) Focal length: 1490mm (plano convex singlet) Aperture: 60mm Stop: 30mm Eyepiece: -75mm (plano concave singlet, 24mm aperture) Observation type: projection (340mm distance, 80mm diameter) Reference: Earth's rotation axis Exposure (transparency): 0.260ms Seeing (SSSMon): 1.0-1.5" (0.8" at best) =================================================================== Total number of sunspots: 24 | |
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