ARRL

ARRL Propagation Bulletin ARLP013 (1995)

SB PROP @ ARL $ARLP013
ARLP013 Propagation de KT7H
 
ZCZC AP81
QST de W1AW  
Propagation Forecast Bulletin 13  ARLP013
>From Tad Cook, KT7H
Seattle, WA  March 17, 1995
To all radio amateurs 
 
SB PROP ARL ARLP013
ARLP013 Propagation de KT7H
 
Solar activity was down last week, with solar flux an average 8
points lower than the previous period, and one day with a sunspot
number of zero.  The geomagnetic A index hit 28 on March 12 and 13,
which indicates very disturbed conditions.  The K index went as high
as six during that period.
 
Solar flux is expected to rise to around 90 on March 20 or 21, the
drop back to the low eighties, and back to 90 on April 3 or 4.
Disturbed conditions could return on March 27 and 28 and again
around April 9.
 
Sunspot Numbers for March 9 through 15 were 22, 0, 11, 26, 35, 37
and 29, with a mean of 22.9.  10.7 cm flux was 78.4, 79.1, 76.1,
76.2, 77.5, 79 and 81.1, with a mean of 78.2.
 
The path projection for this week is from Omaha, Nebraska and New
York City to Cayman Island.
 
>From Omaha, 80 meters looks good from 0000z to 1200z, and 40 meters
nearly around the clock, with the best time on 40 from 0030z to
1100z.  The weakest period on 40 meters should be from 1600z to
2000z.  30 meters also looks excellent around the clock, with a weak
period around 1230z and the strongest signals from 0000z to 1200z.
20 meters looks good from 1230z to 1400z and from 1700z to 0230z.
17 meters should be open from 1400z to 0100z, and 15 meters from
1530z to 2330z.  12 meters has a strong probability of openings from
1630z to 2200z, and 10 meters may be open on some days from 1730z to
2200z.
 
>From New York, check 80 meters from 2300z to 1200z and 40 meters
from 2030z to 1430z.  30 meters should be best from 2330z to 1100z,
with openings around the clock.  20 meters should be best from 1200z
to 1430z and 2030z to 0130z.  17 meters looks good from 1400z to
2330z, and 15 meters from 1600z to 2100z.  12 meters may have an
opening from 1600z to 2200z, and 10 meters around 1830z to 1900z.
NNNN
/EX