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1993-04-04
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SB PROP @ ARRL $ARLP012
ARLP012 Propagation DE KT7H
QST DE W1AW
Propagation Forecast Bulletin 12 ARLP012
From Tad Cook, KT7H
Seattle, WA March 26, 1993
To All Radio Amateurs
Solar activity was low last week. Flux levels averaged 124, about
ten points lower than the average for the previous 90 days. The
geomagnetic field was unsettled to active, with the K index reaching
four or above on most days.
Solar flux should be perking up for the short term, reaching a broad
peak around 155 between April 2 to 5. There may be some
disturbances caused by recurring coronal holes around April 4 and
again on April 17. There also could be some disturbances during the
WPX contest this weekend.
Solar activity this week has been quite a bit lower than it was
during the same week one year ago. Flux values averaged about 40
points higher during that week in 1992. This lower solar flux has a
definite effect on openings on the higher HF bands.
Sunspot Numbers from March 18 to 24 were 98, 115, 84, 112, 99, 97
and 79, with a mean of 97.7. 10.7 cm flux was 110.7, 134.5, 128,
131, 128, 120.8 and 115, with a mean of 124.
The projection this time is for this weekend, from Philadelphia, PA
to French Polynesia. 80 meters should be open from 0300 to
1200 UTC, with the best times from 0400 to 1100 UTC. 40 meters
should be open from 0230 to 1300 UTC, with the best times from 0430
to 1100 UTC. 30 meters should be open from 0200 to 1330 UTC, with
the peak times from 0330 to 1130 UTC. 20 meters should be best from
0100 to 0500 UTC, and again from 1130 to 1300 UTC. 17 meters should
be best from 0100 to 0330 UTC, and again from 1500 to 1630 UTC.
15 meters should be open from 1530 to 0230 UTC, and 12 meters from
1530 to 0100 UTC. 10 meters should be open from 1600 to 2330 UTC,
with the best signals from 1800 to 2100 UTC.
/EX