Sunspot data for 31 March 2025 of period 2025Q1: (PREV DAY - NEXT PERIOD)

Sun250331_0857UTC_sketch.jpgSun250331_0900UTC.jpg





Click here for the sharpened image.
Today we had about 40% cumuli. Transparency in between was good, but the scintillation monitor reported mediocre seeing on average. I made the following observation: 
Observation date/time:   31 March 2025 08:57 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 (343mm distance, 80mm diameter)
Reference:               Earth's rotation axis
Exposure (transparency): 0.480ms (using 82nm bandwidth green filter)
Seeing (SSSMon):         3.5-4.5" (3.0" at best)

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Total number of sunspots:  51

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