ARRL

ARRL Propagation Bulletin ARLP034 (1999)

SB PROP @ ARL $ARLP034
ARLP034 Propagation de K7VVV

ZCZC AP34
QST de W1AW  
Propagation Forecast Bulletin 34  ARLP034
From Tad Cook, K7VVV
Seattle, WA  August 20, 1999
To all radio amateurs 

SB PROP ARL ARLP034
ARLP034 Propagation de K7VVV

Solar flux and sunspot numbers were down again this week.  Average
sunspot numbers were down almost 55 points and average solar flux
was off by over 17 points, when compared to the previous week.
Geomagnetic conditions were quite stormy over the past few days,
with an A index of almost thirty over several days this week.
Conditions should settle down over the next few days, with planetary
A indices of 20, 15 and 10 over Friday through Sunday.  Solar flux
has actually been rising this week, and over the weekend it should
rise to 140, 145 and 150.  Expect continued rising solar flux to hit
180 around August 24, peaking around 190, August 26-29.  Predicted
unsettled geomagnetic days are August 26-28, September 2-5, and
September 11-13.

Sunspot numbers for August 12 through 18 were 100, 82, 79, 87, 71,
67 and 69 with a mean of 79.3.  10.7 cm flux was 123.1, 126.5,
128.1, 131.1, 131.1, 141 and 130.7, with a mean of 130.2, and
estimated planetary A indices were 10, 11, 5, 15, 29, 27 and 26,
with a mean of 17.6.

The path projections for this week are from Salt Lake City, Utah.

To Europe, 80 meters 0200-0530 UTC, 40 meters 0130-0630 UTC, 30
meters 2330-0830 UTC, 20 meters 2030-0200 UTC and 0530-0700 UTC, 17
meters 1630-2330 UTC.

To Southern Africa, 80 meters 0200-0430 UTC, 40 meters 0130-0500
UTC, 30 meters 0030-0530 UTC, 20 meters 2300-0630 UTC, 17 meters
2030-0200 UTC and 0500-0530 UTC, 15 meters 1900-0130 UTC.

To the Caribbean, 80 meters 0100-1030 UTC, 40 meters 0000-1130 UTC,
30 meters 2030-1300 UTC, 20 meters open all hours, best signals
0300-0630 UTC, weakest 0900-1000 UTC, 17 meters 1300-0500 UTC, 15
meters 1530-0300 UTC, 12 meters possibly 1930-2200 UTC.

To South America, 80 meters 0130-1000 UTC, 40 meters 0100-1100 UTC,
30 meters 0030-1130 UTC, 20 meters 2230-1230 UTC, 17 meters 1200-
1400 UTC and 2100-0730 UTC, 15 meters 1300-0600 UTC, 12 meters
1500-0300 UTC, 10 meters 1800-2200 UTC.

To Australia, 80 meters 0730-1300 UTC. 40 meters 0630-1300 UTC, 30
meters 0630-1430 UTC, 20 meters 0430-1600 UTC, 17 meters 0330-0930
UTC, 15 meters 0130-0830 UTC, 12 meters 2100-0600 UTC, 10 meters
2100-0030 UTC.

To Japan, 80 meters 0930-1300 UTC, 40 meters 0830-1400 UTC, 30
meters 0800-1500 UTC, 20 meters 0500-0930 UTC, 17 meters 2030-0730
UTC, 15 meters 2030-0500 UTC.
NNNN
/EX