Solar activity declined this week, with average daily sunspot numbers going from 98 last week to 55.1 in the week ending Wednesday, October 15. Average daily solar flux went from 131.9 to 117.4.

Average planetary A index rose from 6.4 to 10.4. The most unsettled geomagnetic day was Tuesday, October 14, when the planetary A index was 18, and the planetary K index reached 5 for 9 hours overnight. …

American Radio Relay League | Ham Radio Association and Resources

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