QST de W1AW
Propagation Forecast Bulletin 39 ARLP039
From Tad Cook, KT7H
Seattle, WA September 20, 1996
To all radio amateurs
SB PROP ARL ARLP039
ARLP039 Propagation de KT7H
Solar activity was down again last week. Average Solar Flux was down about a point, and average sunspot numbers were down about 3.7. Every day except September 12 had no visible sunspots.
The daily solar flux was below the 90 day average of 71 on each day over the past week.
Solar activity is expected to increase over this week, with solar flux to peak in the mid 70s around September 24 to16. Geomagnetic conditions are expected to peak around September 25 with A indices around 25 and K indices as high as 5. After October 1 solar flux should drop below 70. Geomagnetic conditions should get unstable again around October 7 to13.
The days are growing shorter, and the Fall Equinox will arrive September 22. Because of less daylight 20 meters is becoming more of a daylight band.
Sunspot Numbers for September 12 through 18 were 11, 0, 0, 0, 0, 0 and 0, with a mean of 1.6. 10.7 cm flux was 67.8, 67.3, 67.1, 66.4, 68, 69, and 68.9, with a mean of 67.8.