October 17, 2021 on 10:40 am | In Sun | Comments Off

Clear skies with good seeing conditions.  However, the Sun is spotless today.  AR2882 is gone but managed to accumulate a total active region area during the time it was visible of 3370 millionths, which is the third largest so far in Cycle 25, compared to AR2786 which reached 7300 millionths.  Some nice proms are also visible at the western limb.  Today only full disk images in the three wavelengths.

2021-10-17-1426_3-ThRmk-540nm-Spotless922.jpg 2021-10-17-1430_0-ThRmk-Ha-Spotless.jpg 2021-10-17-1433_7-ThRmk-CaK-Spotless922.jpg

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