QST de W1AW
Propagation Forecast Bulletin 40 ARLP040
From Tad Cook, KT7H
Seattle, WA September 27, 1996
To all radio amateurs
SB PROP ARL ARLP040
ARLP040 Propagation de KT7H
Solar activity remains low, and in fact there were no visible sunspots over the past week. Average sunspot number is zero this week, down from 1.6 of last week. Solar flux was actually up slightly, from 67.8 to 69.6. Every day the solar flux was lower than the 71 average for the previous 90 days.
Geomagnetic conditions were active over the past two weeks. It was the worst on September 20, when the A index was 37 and the K index was five for half of the day.
Geomagnetic disturbances are expected to slack off through the end of the month, and the A index should be below 10 from October 2 to 6. Solar flux should remain flat near 70 until the end of the month, then dip down slightly until mid October, Look for recurring disturbances around October 7 to 8, although it should not be as bad as it was over the past two weeks.
Sunspot Numbers for September 19 through 25 were 0, 0, 0, 0, 0, 0 and 0, with a mean of 0. 10.7 cm flux was 69.2, 69.2, 69.8, 68.6, 69.9, 70 and 70.8, with a mean of 69.6.