ARRL

ARRL Propagation Bulletin ARLP039 (1996)

SB PROP @ ARL $ARLP039
ARLP039 Propagation de KT7H

ZCZC AP59
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.
NNNN
/EX