ARRL

ARRL Propagation Bulletin ARLP013 (1997)

SB PROP @ ARL $ARLP013
ARLP013 Propagation de KT7H

ZCZC AP13
QST de W1AW
Propagation Forecast Bulletin 13  ARLP013
From Tad Cook, KT7H
Seattle, WA  March 29, 1997
To all radio amateurs

SB PROP ARL ARLP013
ARLP013 Propagation de KT7H

Solar activity turned down over the past week.  Hard to believe,
since we still seemed to be already at the bottom of the solar
cycle.  The average solar flux for the previous 90 days has been 75
for quite some time now, but on March 20 it became 74.  The solar
flux on every day this week was below that average level.  Since
the average value for 90 days has dropped, and we consistently see
solar flux values below the average, this indicates that we really
have not seen a turn up in the cycle.

After the first of the month the solar flux is expected to rise a
few points.  The K and A index is expected to turn down in time for
the DX contest this weekend, but solar flux will still be low.

Sunspot Numbers for March 20 through 26 were 23, 0, 0, 0, 0, 0 and
0 with a mean of 3.3.  10.7 cm flux was 71.5, 70.5, 70.6, 70.7, 71,
70.6 and 69.8, with a mean of 70.7, and estimated planetary A
indices for the same period were 3, 5, 9, 4, 6, 12, and 14, with a
mean of 7.6.
NNNN
/EX