The K7RA Solar Update
Tad
Cook, K7RA, Seattle, reports: On December 22 at 0002 UTC, the
Australian Space Forecast Centre forecast enhanced geomagnetic activity
until December 24, with minor storms likely and some major storm periods
possible.
December
15-21 solar activity was little changed from the previous 7 days,
although no sunspots were visible on December 16 and 17. Average daily
sunspot numbers declined from 13 to 11, and average daily solar flux
bumped up 1 point to 73.2. Average planetary A index dipped from 13.3 to
7.9, and average mid-latitude A index from 9 to 5.7.
The
outlook shows daily solar flux at 75 and 80 on December 22-23; 85 on
December 24-28; 75 on December 29; 77 on December 30-31; 79 on January
1-3; 77 on January 4-5; 75 on January 6-10; 77 on January 11-12; 75 on
January 13-14; 73 on January 15-17; 75 on January 18-23; 77 on January
24-27, and 79 on January 28-30.
Predicted
planetary A index is 30 on December 22; 12 on December 23-24; 8 on
December 25; 5 on December 26-January 1; 8, 10, 20, 22, 16, 14, and 6 on
January 2-8; 5 on January 9-13; 10 on January 14; 15 on January 15-16;
25 and 28 on January 17-18; 12 on January 19-20; 8 on January 21, and 5
on January 22-28.
Sunspot numbers for December 15
through 21 were 12, 0, 0, 13, 12, 25, and 15, with a mean of 11. The
10.7 centimeter flux was 72.5, 72.6, 72.1, 72.3, 72.8, 74.9, and 75,
with a mean of 73.2. Estimated planetary A indices were 3, 3, 6, 9, 5,
6, and 23, with a mean of 7.9. Estimated mid-latitude A indices were 2,
2, 3, 6, 5, 4, and 18, with a mean of 5.7.
Thanks to ARRL
