ARRL

ARRL Propagation Bulletin ARLP004 (1997)

SB PROP @ ARL $ARLP004
ARLP004 Propagation de KT7H

ZCZC AP04
QST de W1AW
Propagation Forecast Bulletin 4  ARLP004
From Tad Cook, KT7H
Seattle, WA  January 24, 1997
To all radio amateurs

SB PROP ARL ARLP004
ARLP004 Propagation de KT7H

We are still at the solar minimum, with very little activity to
report.  Since there are no really active regions that we know of on
the solar surface, there is no activity to forecast as the solar
surface rotates relative to the Earth.

This week's average solar flux was exactly the same as the week
previous, and the sunspot numbers were barely higher.  Unlike the
previous week, there were no periods of geomagnetic activity, and
the A index stayed in the single digits.

The next few weeks are expected to stay the same, with the solar
flux around the low to mid seventies, and the A index around five.
The A index may jump up to around ten on February 3, and again
around February 6-9.

Sunspot Numbers for January 16 through 22 were 16, 12, 34, 0, 0, 0
and 0 with a mean of 8.9.  10.7 cm flux was 74.8, 74.1, 74.6, 75.3,
76.8, 74.1 and 73, with a mean of 74.7.  Estimated planetary A
indices for the same period were 3, 2, 5, 4, 5, 9, and 5, with a
mean of 4.7.
NNNN
/EX