ARRL

ARRL Propagation Bulletin ARLP014 (1999)

SB PROP @ ARL $ARLP014
ARLP014 Propagation de K7VVV

ZCZC AP14
QST de W1AW  
Propagation Forecast Bulletin 14  ARLP014
From Tad Cook, K7VVV
Seattle, WA  April 1, 1999
To all radio amateurs 

SB PROP ARL ARLP014
ARLP014 Propagation de K7VVV

This bulletin is going out one day early because ARRL HQ is closed
on Friday.

Solar activity has been in the doldrums again recently.  This past
week the average solar flux was over 20 points lower than the
previous week, and average sunspot numbers were over 40 points
lower.  The average weekly sunspot number reported in this bulletin
has not been this low since February 4-10 of this year, and the
average solar flux hasn't been this low since June 18-24 of last
year.  The only bright spot has been the season, with early spring
being a good time for HF propagation.

April 1 is not only the end of March, but the end of the first
quarter of 1999, a time to look at some averages.

The average solar flux for March was only 126.3, much lower than the
142 average for February, 142.4 for January, and 150.1 for December.
This solar cycle is supposed to peak next year at much higher levels
than it is running right now, yet it seems to be in decline.

The average flux for the first quarter of 1999 is 136.7, which is
very close to the 135.4 average for the last quarter of 1998 and not
much higher than the 129.2 average for the third quarter of last
year.

Not very encouraging, is it?

For the next few days, Thursday through Saturday, expect solar flux
around 105, 110 and 110, and a planetary A index around 15,
indicating unsettled to active geomagnetic conditions.  After
Saturday look for a rising solar flux, reaching 130 by Monday, 140
by April 8, and peaking around 150 for April 10-13.  Unless some new
activity appears on the sun, flux levels may be back to where they
are now after April 20.  Look for unsettled geomagnetic conditions
around April 10-11 and active conditions around April 25.

In brief VHF news, many North American 6 meter stations were working
South and Central America on March 24 and 28 with good signals.
TI5KD in Costa Rica worked several African stations on 6 meters on
Monday.

Sunspot Numbers for March 25 through 31 were 48, 33, 45, 65, 63, 72
and 70 with a mean of 56.6.  10.7 cm flux was 107, 103.6, 104.5,
103, 104.2, 104.7 and 102.4, with a mean of 104.2, and estimated
planetary A indices were 8, 6, 4, 6, 24, 18 and 14, with a mean of
11.4.

Here are some path projections for this weekend from Dallas, Texas:

To Western Europe, 80 meters 2345-0645z, 40 meters 2330-0800z, 30
meters 2200-0700z, 20 meters 1300-2300z, 17 meters 1500-2000z, 15
meters 1730-1900z.

To Eastern Europe, 80 meters 0030-0430z, 40 meters 2330-0600z, 30
meters 2200-0730z, 20 meters 1300-2130z, 17 meters 1400-2000z, 15
meters 1630-1830z.

To Southern Africa, 80 meters 0000-0445z, 40 meters 2345-0515z, 30
meters 2245-0600z, 20 meters 2030-0230z and around 0500z, 17 meters
1700-0030z, 15 meters 1230-2300z, 12 meters 1600-1900z.

To the Caribbean, 80 meters 2330-1115z, 40 meters 2130-1300z, 30
meters 1100-0800z, 20 meters 1200-0300z, 17 meters 1400-0000z, 15
meters 1800-2030z.

To South America, 80 meters 0030-1030z, 40 meters 2330-1100z, 30
meters 2230-1200z, 20 meters 1130-1500z and 1900-0730z, 17 meters
1230-0500z, 15 meters 1300-0300z, 12 meters 1430-2300z, 10 meters
1700-2130z.

To Hawaii, 80 meters 0400-1330z, 40 meters 0300-1430z, 30 meters
0130-1600z, 20 meters 1600-1100z, 17 meters 1600-0600z, 15 meters
1630-0500z, 12 meters 1730-0200z, 10 meters 1830-2330z.

To the South Pacific, 80 meters 0500-1300z, 40 meters 0430-1330z, 30
meters 0330- 1500z, 20 meters 0130-1100z and 1230-1400z, 17 meters
1700-0630z and around 1330z, 15 meters 1700-0530z, 12 meters
1730-0300z, 10 meters 1800-0100z.

To Australia, 80 meters 0730-1230z, 40 meters 0700-1330z, 30 meters
0600-1400z, 20 meters 0400-1100z and 1230-1500z, 17 meters
0100-0600z, 15 meters 2100-0430z, 12 meters 2100-0130z, 10 meters
2200-2330z.

To Japan, 80 meters 0830-1230z, 40 meters 0800-1300z, 30 meters
0700-1430z, 20 meters 1300- 1530z and 0200-0600z, 17 meters
2030-0400z, 15 meters 2100-0200z.

To Central Asia, 30 meters 0000-0130z, 20 meters 0030-0400z, 17
meters 0130-0230z.
NNNN
/EX