SB PROP @ ARL $ARLP010
ARLP010 Propagation de KT7H
 
QST de W1AW  
Propagation Forecast Bulletin 10  ARLP010
From Tad Cook, KT7H
Seattle, WA  March 11, 1994
To all radio amateurs 
 
Coronal holes played havoc with the Earth's magnetosphere again last
week, sending the A and K indices soaring.  Conditions were actually
stable from the 4th through the 6th, but were otherwise very
unstable, with frequent reports of K indices around 5 and 6.  When
this happens, absorption of HF signals becomes a problem, especially
over polar paths.
 
Solar flux dropped slowly after peaking just above 100 at the start
of the period.  Look for the flux to continue dropping, reaching a
low near 85 around the middle of this month.  It will then rise and
peak again near 105 before month's end.
 
Active geomagnetic conditions may remain over the next few days,
occurring again around the end of the month.
 
Sunspot Numbers from March 3 through 9 were 122, 80, 86, 101, 80, 80
and 68, with a mean of 88.1.  10.7 cm flux was 100.9, 97.9, 95.7,
95.5, 91.3, 91.3 and 89.9, with a mean of 94.6.
 
The path projection this week is from Chicago, Illinois to Guyana,
where 8R1/N4VA is operating.
 
80 meters should be open from 2330 to 1030z, with the best
conditions from 0200 to 0930.  40 meters looks good from 2230 to
1100, with the best shot from 0030 to 0930.  30 meters may be
open on many days almost around the clock, with best conditions from
2230 to 0630.  20 meters should be good from 1500 to 0130, and
17 meters from 1430 to 2300.  Check 15 meters from 1600 to 2000.
10 and 12 meters do not look too promising over this path, but check
12 meters around 1630 to 2130 and 10 meters from 1830 to 1930.  
NNNN
/EX