ARRL

ARRL Propagation Bulletin ARLP003 (2003)

SB PROP @ ARL $ARLP003
ARLP003 Propagation de K7VVV

ZCZC AP03
QST de W1AW  
Propagation Forecast Bulletin 3  ARLP003
From Tad Cook, K7VVV
Seattle, WA  January 17, 2003
To all radio amateurs 

SB PROP ARL ARLP003
ARLP003 Propagation de K7VVV

Solar flux and sunspot numbers peaked early in the week and are
headed downward again. Average daily solar flux rose to 173.6 this
week from 149.4 last, and sunspot number averages went from 137.9 to
200.9.

Activity should continue declining, with Friday through Monday
values of 140, 135, 135 and 125, reaching a minimum around 115 from
January 25-28. Geomagnetic activity for the near term is predicted
to be quiet to unsettled.

You can see the general downward trend in activity in the charts at
http://www.wm7d.net/hamradio/solar/past_cycle.shtml .
There is tremendous variability, but the overall trend is pretty
clear.

Over the next few years we'll see a dramatic drop. Current
projections from NOAA show the minimum solar flux between September
2006 and April, 2007, and sunspot minimum around December 2006 to
January 2007.

Sunspot numbers for January 9 through 15 were 206, 199, 238, 232,
182, 176, and 173, with a mean of 200.9. 10.7 cm flux was 182.9,
184.7, 188.8, 173.4, 171.8, 164, and 149.9, with a mean of 173.6.
Estimated planetary A indices were 7, 10, 10, 11, 8, 10, and 8, with
a mean of 9.1.
NNNN
/EX