Sunspot activity increased again this week, but on Tuesday and Wednesday -- July 27-28 -- a stiff solar wind increased Earth’s geomagnetic activity, which is a negative for HF propagation. Sunspot numbers for July 22-28 were 39, 45, 41, 39, 39, 15 and 31, with a mean of 35.6. The 10.7 cm flux was 87.7, 86.4, 85.2, 85.2, 84.4, 82.6 and 85.3, with a mean of 85.3. The estimated planetary A indices...
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