The average daily sunspot numbers this week were up more than 47 points to 99.3, while the average daily solar flux rose nearly 35 points to 131.7. Sunspot numbers for July 26-August 1 were 77, 91, 108, 79, 106, 116 and 118, with a mean of 99.3. The 10.7 cm flux was 114.7, 123.3, 126.6, 131.4, 136, 139.8 and 150.1, with a mean of 131.7. The estimated planetary A indices were 4, 5, 11, 6, 13, 6 …

American Radio Relay League | Ham Radio Association and Resources

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