ARRL

ARRL Propagation Bulletin ARLP022 (1999)

SB PROP @ ARL $ARLP022
ARLP022 Propagation de K7VVV

ZCZC AP22
QST de W1AW  
Propagation Forecast Bulletin 22  ARLP022
From Tad Cook, K7VVV
Seattle, WA  May 28, 1999
To all radio amateurs 

SB PROP ARL ARLP022
ARLP022 Propagation de K7VVV

Solar flux and sunspot numbers were down slightly from last week.
Average flux was down less than three points, and average sunspot
numbers were down about 14 points from the week previous.
Geomagnetic disturbances were down also, but only by a little.  The
most active day was May 25, when the planetary A index was 19 and
the planetary K index was as high as five.

For the CQ Worldwide WPX CW Contest this weekend, the predicted
solar flux for Friday through Sunday is 155, 165 and 165, which is
good.  Unfortunately there was a coronal mass ejection on the sun
which may cause a planetary A index of 12, 25 and 20 for those same
three days.  Saturday could be difficult for the contest.

Beyond the weekend, the solar flux should reach 175 by June 7 or 8,
then drop to 150 around June 11, 140 by June 16, and 130 around June
21.  June 14 could be bad for HF because of geomagnetic disturbances
caused by coronal hole effects.

In VHF news, N4VHF in Florida worked ZF1DC on 6 meters in Cayman
Islands on May 17 and KA4DON just a short distance away worked
IK4GRO in Italy on 6 meters on May 22.  On May 23 N0LL in Kansas
worked or heard a number of stations up and down the East Coast and
around the Midwest using 2 meter E-skip.

Sunspot Numbers for May 20 through 26 were 121, 128, 121, 104, 104,
130 and 152 with a mean of 122.9.  10.7 cm flux was 142.5, 140.3,
140.2, 140.7, 136.9, 143.1 and 152.6, with a mean of 142.3, and
estimated planetary A indices were 10, 7, 5, 10, 11, 19 and 8, with
a mean of 10.

The path projection for this week is from Cleveland, Ohio.

To Europe, 80 meters 0030-0500 UTC, 40 meters 2300-0630 UTC, 30
meters 2130-0830 UTC, 20 meters all hours, best signals 0100-0430
UTC, worst 0730-0800 UTC, 17 meters 2000-0000 UTC.

To Southern Africa, 80 meters 0030-0430 UTC, 40 meters 0000-0430
UTC, 30 meters 2230-0600 UTC, 20 meters 2030-0700 UTC, 17 meters
2000-0130 UTC.

To the Caribbean, 80 meters 2330-1000 UTC, 40 meters 2200-1200 UTC,
30 meters all hours, best 0130-0900 UTC, weakest 1600-1700 UTC, 20
meters 2230-1130 UTC, 17 meters 1930-1400 UTC, 15 meters 2300-0430
UTC.

To South America, 80 meters 0030-0930 UTC, 40 meters 2330-1000 UTC,
30 meters 2200-1100 UTC, 20 meters all hours, strongest 0100-0930
UTC, weakest 1600-1800 UTC, 17 meters 1230-0630 UTC, 15 meters
0100-0300 UTC.

To Australia, 80 meters 0700-1030 UTC, 40 meters 0600-1130 UTC, 30
meters 0600-1200 UTC, 20 meters 0400-1400 UTC, 17 meters 0200-0900
UTC, 15 meters 0100-0600 UTC.

To Japan, 40 meters 0930-1030 UTC, 30 meters 0800-1230 UTC, 20
meters 1700-1300 UTC.
NNNN
/EX