Solar indicators, both
sunspot numbers and solar flux, both dropped this week, in fact on April 8 there
were no sunspots. Average daily sunspot numbers declined from 65.9 to 16.6, and
average daily solar flux went from 96.5 to 73.8, compared to the previous seven
days, .
Average daily planetary A index went
from 15.6 to 10.6, and average daily mid-latitude A index declined from 13 to
9.3.
Predicted solar flux shows 75 on April
14-15, 85 on April 16-17, 80 on April 18, 95 on April 19-21, 92 on April 22-23,
90 on April 24-29, 80 on April 30, 78 on May 1-2, 72 on May 3-4, 75 on May 5-6,
72 on May 7-12, 75 and 85 on May 13-14, 88 on May 15-16, 95 on May 17-18, 92 on
May 19-20, and 90 on May 21-26.
Predicted planetary A index is 8, 10 and
8 on April 14-16, 25 on April 17-18, 12 and 8 on April 19-20, 5 on April 21-22,
then 55, 28, 20 and 22 on April 23-26, then 28, 15, 8 and 5 on April 27-30, then
20, 10, 8 and 10 on May 1-4, 15 on May 5-6, 12 on May 7, 8 on May 8-10, 5 on May
11-13, then 20, 18 and 10 on May 14-16, 5 on May 17-19, then 55, 28, 20, 22, 28,
15 and 8 on May 20-26.
F.K. Janda, OK1HH, sent us his
geomagnetic activity forecast for the period April 14 to May 9, 2017.
Quiet on April 16, 20-22, 30, May 5, 9-10
Mostly quiet on April 14-15, 21, May 3-4, 6
Quiet to unsettled April 19, 29, May 1, 2, 7, 8
Quiet to active on April 23, 25-28
Active to disturbed on April 17-18, 24
