ARRL

ARRL Propagation Bulletin ARLP017 (2000)

SB PROP @ ARL $ARLP017
ARLP017 Propagation de K7VVV

ZCZC AP17
QST de W1AW  
Propagation Forecast Bulletin 17  ARLP017
From Tad Cook, K7VVV
Seattle, WA  April 28, 2000
To all radio amateurs 

SB PROP ARL ARLP017
ARLP017 Propagation de K7VVV

Sunspots and solar flux were up this week.  The average sunspot
number was up over 40 points and average solar flux rose over 30
points over the past week.  Geomagnetic indices have been mostly
quiet, with April 24 the most active day.

Last week's bulletin ARLP016 said that the solar flux should be up
around 220 this weekend, but conditions are not cooperating.
Although activity has been higher this week than last, it is not as
high as expected.

Solar flux is expected to hover around 175 to 185 until April 8,
then dip below 170, and rise to around 200 from May 19 through 28.
The planetary A index prediction indicates unsettled conditions for
Friday.  The A index should stay quiet from this weekend until May 6
and 7, when it may rise to 15.

Predicted solar flux for the next five days, Friday through Tuesday
is 180, 175, 175, 180 and 180.

Sunspot numbers for April 20 through 26 were 179, 211, 226, 252,
222, 229 and 197 with a mean of 216.6. 10.7 cm flux was 180.6,
187.3, 201.8, 206.1, 205.6, 202.5 and 189.9, with a mean of 196.3,
and estimated planetary A indices were 14, 10, 7, 8, 21, 6 and 4,
with a mean of 10.

Path projections for this weekend are from Wisconsin.

To Europe, 80 meters 0100-0530 UTC, 40 meters 2330-0630 UTC, 30
meters 2230-0730 UTC, 20 meters 2100-0700 UTC, 17 meters 2000-0300
UTC, 15 meters 1330-0100 UTC, 12 meters and 10 meters possibly
1700-2000 UTC.

To Southern Africa, 80 meters 0030-0430 UTC, 40 and 30 meters 0000-
0430 UTC, 20 meters 2300-0530 UTC, 17 meters 2130-0200 UTC, 15
meters 2100-0130 UTC.

To South America, 80 meters 0030-1000 UTC, 40 meters 0000-1000 UTC,
30 meters 2330-1030 UTC, 20 meters 2230-1130 UTC, 17 meters 0930-
1200 UTC and 2200-0630 UTC, 15 meters 1130-1230 UTC and 2100-0500
UTC, 12 meters 1400-2300 UTC.

To the Caribbean, 80 meters 0000-1030 UTC, 40 meters 2230-1130 UTC,
30 meters 2000-1330 UTC, 20 meters open all hours, best 0100-0930
UTC, weakest 1500-1900 UTC, 17 meters open all hours, weakest 0730-
0800 UTC and 1300-1530 UTC, 15 meters 1000-1600 UTC and 1730-0530
UTC, 12 meters 1200-0330 UTC, 10 meters 1530-2130 UTC.

To Australia, 80 meters 0900-1130 UTC, 40 meters 0830-1200 UTC, 30
meters 0730-1230 UTC, 20 meters 0730-1300 UTC, 17 meters 0700-0830
UTC and 1130-1300 UTC, 15 meters 0600-0700 UTC and 1300-1500 UTC.

To Japan, 80 meters 1000-1030 UTC, 40 meters 0930-1130 UTC, 30
meters 0830-1200 UTC, 20 meters 0800-1230 UTC, 17 meters 0600-0800
UTC and 1130-1500 UTC, 15 meters 1430-1500 UTC and 1830-2000 UTC and
0330-0500 UTC, 12 meters 2030-2200 UTC, 10 meters possibly 2000-0400
UTC.
NNNN
/EX