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The September 2020 monthly mean data results in a smoothed sunspot number for March 2020 (the red curve) that increased slightly from last month. NASA and NOAA declared December 2019 as the official solar minimum. Hopefully Cycle 25 will rise with more vigor! |
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September 2020 didn’t have as many Cycle 25 sunspots as the previous months. This is nothing to worry about, as this trend is expected from previous solar minimum periods. |
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ARRL DX CW 2012 - Which 10M Path Is the ionosphere really lower Butterfly Diagrams and Solar Minimum A Look at All Twenty Three Solar Cycles The Robust Equatorial Ionosphere
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