The K7RA Solar Update
Tad
Cook, K7RA, Seattle, reports: We only saw sunspots on 2 days of the
reporting week, on March 30 and 31, when the daily sunspot numbers were
11 and 12. No sunspots appeared during the previous week, so the average
daily sunspot number rose from 0 to 3.3. Average daily solar flux
inched upward from 68.2 to 68.6.
Geomagnetic
indicators were quiet, with average daily planetary A index declining
from 10.6 to 5, and average mid-latitude A index dipping from 8.9 to 4.
Predicted solar flux is 69 on April 5-11; 68 on April 12-22; 69 on April 23-May 6, and 68 from May 7-19.
Predicted
planetary A index is 10 and 8 on April 5-6; 5 on April 7-9; 10, 15, and
20 on April 10-12; 18 on April 13-14; 15, 10, 5, and 8 on April 15-18;
15 on April 19-21; 12 and 10 on April 22-23; 5 on April 24-May 6; 10,
15, and 20 on May 7-9; 18 on May 10-11; 15, 10, 5, and 10 on May 12-15;
15 on May 16-18, and 12 on May 19.
Sunspot numbers
for March 29 through April 4, 2018 were 0, 11, 12, 0, 0, 0, and 0, with
a mean of 3.3. The 10.7-centimeter flux was 69, 68.8, 69, 69, 68.4,
67.8, and 68.5, with a mean of 68.6. Estimated planetary A indices were
4, 5, 7, 5, 5, 4, and 5, with a mean of 5. Estimated mid-latitude A
indices were 3, 4, 6, 4, 4, 3, and 4, with a mean of 4.
In
Friday's bulletin look for an updated forecast and reports from
readers, including one from K3MSB on difficulties working Australia from
Pennsylvania on 160 meters. Send me your reports or observations.
TNX ARRL
