Sunspot activity continued to weaken over the past seven days (August 28 through September 3). Average daily sunspot numbers declined from 113.4 to 85.1, and average daily solar flux went from 130.5 to 126.7. Geomagnetic activity was up recently, with average planetary A index increasing from 7.4 to 14.7, nearly double the values from the August 21-27 period week earlier.
The latest predicted so…
American Radio Relay League | Ham Radio Association and Resources
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