Ten new sunspot groups appeared over this reporting week (August 15-21), but both solar flux and sunspot numbers were lower, due to the extraordinary numbers in the previous week.
Average daily sunspot number declined from 255 to 180.3, while average daily solar flux went from 284.9 to 232.7.
Geomagnetic numbers were quieter. Average daily planetary A index declined from 28.6 to 11.9, and aver...
