We saw an uptick in solar indices over the past reporting week (May 1-7) compared to the previous seven days, with average daily sunspot number rising from 73.4 to 118.4, and average daily solar flux up 13 to 135.6. The most active geomagnetic days were May 4-5, with planetary A index at a relatively moderate 16 and 10, mid-latitude A indices of 15 and 11, and the high latitude college A index …

American Radio Relay League | Ham Radio Association and Resources

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