ARRL

ARRL Propagation Bulletin ARLP009 (1997)

SB PROP @ ARL $ARLP009
ARLP009 Propagation de KT7H

ZCZC AP09
QST de W1AW
Propagation Forecast Bulletin 9  ARLP009
From Tad Cook, KT7H
Seattle, WA  February 28, 1997
To all radio amateurs

SB PROP ARL ARLP009
ARLP009 Propagation de KT7H

Here was one more uneventful week, still at the bottom of the solar
cycle.  February 21 and 26 had some geomagnetic activity, but
otherwise all was quiet.  On most days the sunspot number was zero,
and on every day the solar flux was less than the average for the
previous 90 days.

For the DX contest this weekend, don't expect any big change.  Solar
flux should continue in the low seventies, and don't expect any
unsettled or stormy geomagnetic conditions until March 7-10 and
again around March 16.  Based on the previous solar rotation, the
solar flux could go to the high seventies toward the middle of
March.  Twenty meters should remain the best band for worldwide
propagation during daylight, followed by 40 meters after dark.

Sunspot Numbers for February 20 through 26 were 0, 0, 0, 0, 11, 12
and 0 with a mean of 3.3.  10.7 cm flux was 72.6, 73.2, 73.5, 74.6,
74.6, 74.1 and 74, with a mean of 73.8.  Estimated planetary A
indices for the same period were 4, 10, 6, 9, 8, 5, and 13, with a
mean of 7.9.
NNNN
/EX