ARRL

ARRL Propagation Bulletin ARLP018 (1995)

SB PROP @ ARL $ARLP018
ARLP018 Propagation de KT7H
 
ZCZC AP86
QST de W1AW  
Propagation Forecast Bulletin 18  ARLP018
>From Tad Cook, KT7H
Seattle, WA  April 22, 1995
To all radio amateurs 
 
SB PROP ARL ARLP018
ARLP018 Propagation de KT7H
 
Solar activity was up last week, with an average of almost a 15
point increase in solar flux, and a huge increase in sunspots.
Combined with low A and K indices indicating stable geomagnetic
conditions, this produced good HF propagation.  Solar flux is
expected to taper off from around 90 down to 80 by the end of the
month, and 75 during the first week in May.
 
There is a good chance of disturbed conditions this weekend, and
again around May 4 or 5, both due to recurring coronal holes.  Watch
for a return to truly quiet conditions after May 10.
 
Sunspot Numbers for April 13 through 19 were 47, 67, 67, 81, 75, 64
and 64, with a mean of 66.4.  10.7 cm flux was 82.8, 88.3, 91.4, 89,
88.9, 89.9 and 91.8, with a mean of 88.9.
 
The path projection for this week is to Western Samoa from Kodiak,
Alaska and Tulsa, Oklahoma.
 
>From Alaska 80 meters looks good from 0630z to 1500z, and 40 meters
from 0530z to 1600z.  Check 30 meters from 0500z to 1200z and 1430z
to 1630z.  20 meters should be good from 0230z to 1030z and 1730z to
1930z, and 17 meters from 1830z to 0800z.  On some days 15 meters
may be open from 1930z to 0630z.
 
>From Oklahoma 80 meters should be open from 0530z to 1200z, 40
meters from 0430z to 1300z, and 30 meters from 0400z to 1400z, with
a possible fade around 1000z.  Check 20 meters from 0200z to 0730z
and again around 1230z to 1330z.  17 meters looks good from 1730z to
0530z, and 15 meters should be open most days from 1800z to 0100z.
12 meters may be open on some days from 1930z to 2230z, and 10
meters on rare occasions over the same period.
NNNN
/EX