ARRL

ARRL Propagation Bulletin ARLP002 (1997)

SB PROP @ ARL $ARLP002
ARLP002 Propagation de KT7H

ZCZC AP02
QST de W1AW
Propagation Forecast Bulletin 2  ARLP002
From Tad Cook, KT7H
Seattle, WA  January 10, 1997
To all radio amateurs

SB PROP ARL ARLP002
ARLP002 Propagation de KT7H

Last week's bulletin reported that solar flux was expected to peak
for the short term in the mid-eighties around January 14.  That
estimate has been revised down a bit to the high seventies on
January 13 and 14.  Flux values are then expected to drift down
gradually to just above seventy around the end of the month.  Of
course this is based upon the previous solar rotation, and we never
know when a new active region may surprise us and drift into view.

Average solar flux this week was about the same as the week
previous, but gradually inching upward.  Sunspot numbers were up
just a little.  The solar flux on every day this week was below the
average for the past 90 days, which was 76.

Sunspot Numbers for January 2 through 8 were 0, 0, 13, 15, 15, 12
and 0 with a mean of 7.9.  10.7 cm flux was 72, 73.3, 73.8, 74.4,
73.1, 73.3 and 73.8, with a mean of 73.4.  Planetary A indices for
the same period were 5, 2, 4, 3, 2, 10, and 7, with a mean of 4.7.
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/EX