Each of the weekly solar
and geomagnetic indicators that we track
were lower this week.
Average daily sunspot number dropped 10.6
points to 25.1, and avera
ge daily solar flux was 4.5 points lower
than the previous week at
76.9.
It is comforting to see
though that we have not witnessed a day with
0 sunspots since April 17.
Average planetary and mid-latitude A
index were both 5.6, down
from the previous week which had planetary
A index at 26.4 and
mid-latitude at 18.4.
The A index is expected to
remain quiet until May 17-20.
As of Thursday night, May
4, the predicted solar flux is 76 on May
5-8, 74 on May 9-12, 75 on
May 13-14, 80 on May 15-18, 85 on May
19-21, 80 on May 22-23, 77
on May 24-27, 75 on May 28-30, 73 on May
31 through June 8, 75 on
June 9-10, 80 on June 11-14, 85 on June
15-16, and 88 on June
17.
Predicted planetary A index
is 5 and 8 on May 5-6, 5 on May 7-9,
then 8, 5, 8, 8, 5, and 8
on May 10-15, then 15, 30 and 25 on May
16-18, then 45, 50, 15, 10
and 8 on May 19-23, then 5 on May 24-27,
then 12 and 8 on May 28-29,
5 on May 30 through June 1, 8 on June
2-4, and 5 on June 5-10,
then 8, 15, 30, 25, 45 and 50 on June
11-16.
Also related to planetary A
index is the OK1HH bulletin from the
Czech Propagation Interest
Group:
"Geomagnetic field will
be:
Quiet on May 10, 14-15,
Mostly quiet on May 9, 13,
16, 25-30
Quiet to unsettled May 5-6,
22-24, 31
Quiet to active on May 7-8,
11-12, 19-21
Active to disturbed on May
17-18
"Amplifications of the
solar wind from coronal holes are expected on
May (5-9,) 16-19,
(20).
