SB PROP @ ARL $ARLP041
From Tad Cook, KT7H
Seattle, WA  October 7, 1994
To all radio amateurs 
 
ARLP041 Propagation de KT7H
 
A recurring coronal hole on the Sun's surface is causing some real
havoc with the Earth's geomagnetic field.  This has caused high
absorption and poor conditions on HF bands.  The worst day was
October 3, when the A index was a very high 65 and the K index was 7
over a six hour period.  This area should rotate into view again at
the end of the month, and more trouble is expected.
 
In the short term expect the solar flux to hover in the low
seventies, with only unsettled conditions.  MUF values will be low,
but that is expected as the current solar cycle continues its
decline.
 
Sunspot Numbers for September 29 through October 5 were 24, 22, 23,
22, 22, 34 and 69, with a mean of 30.9.  10.7 cm flux was 74.7,
74.5, 74.6, 74.5, 74.2, 74.7 and 79.4, with a mean of 75.2.
 
The path projection this week is from Hawaii to Micronesia.
 
80 meters should be open from 0700z to 1700z, peaking from 0900z to
1600z.  Check 40 meters from 0530z to 1800z, and 30 meters from
0430z to 1445z and again from 1900z to 2000z.  20 meters looks good
from 1900z to 1200z most days, and on some until 1400z.  17 meters
should be open from 1930z to 0730z, and 15 meters from 2000z to
0630z.  12 and 10 meters actually look open over this path, with 12
meters open from 2030z to 0600z and 10 meters from 2130z to 0530z.
NNNN
/EX