ARRL

ARRL Propagation Bulletin ARLP013 (1999)

SB PROP @ ARL $ARLP013
ARLP013 Propagation de K7VVV

ZCZC AP13
QST de W1AW  
Propagation Forecast Bulletin 13  ARLP013
From Tad Cook, K7VVV
Seattle, WA  March 26, 1999
To all radio amateurs 

SB PROP ARL ARLP013
ARLP013 Propagation de K7VVV

Solar activity dropped again last week, with average solar flux off
over 21 points and average sunspot numbers down by over 19 points.
There was some saving grace for HF operators though.  One was the
relatively low geomagnetic activity, with A indices in the single
digits only, and the other was the arrival of the vernal equinox,
when daylight is equal in the southern and northern hemispheres.

Note that the highest solar flux for the current cycle was on
February 14, when the noon reading was 204.6 and the afternoon
reading was actually slightly higher at 208.2.  Yet the noon reading
on Wednesday of this week was 100 points lower, and the morning
reading was 106.8.

Don't expect a big jump in solar activity for the CQ Worldwide WPX
Phone Contest this weekend.  Predicted solar flux for Friday through
Sunday is 105, 105 and 110, and the planetary A index is somewhat
unsettled at 12 for all three days.

Beyond the weekend expect the solar flux to rise to 130 by the end
of the month, then go to 135 around April 5 and 140 two days later.
It is expected to reach 150 around April 10-14.  Look for recurring
coronal holes to bring back unsettled to active conditions around
March 28 through April 4, and possibly another week beyond that.
There is also a possibility of increased solar flare activity over
the same period until April 3.

N2XRM sent along a nice reference to a URL of aurora web links from
the University of Alaska's Poker Flat Research Range at
http://www.pfrr.alaska.edu/~pfrr/AURORA/LINKS.HTM

N4VHF sent a list of 6 meter DX he has worked this month from North
Florida.  His best was LU8WAT who was using only 6 watts and a 5
element beam, but was S7 and 5,340 miles away.

N1UAI has been having a ball on 10 meter FM, and told about working
stations around the northeast via a repeater in Dallas.  He hears
this repeater on 29.66 MHz almost every day since last fall.

WA5IYX in San Antonio reported some unexpected and unseasonable
E-skip on 6 meters on Tuesday and Wednesday this week, including
stations in Mexico and South America.

Sunspot Numbers for March 18 through 24 were 127, 157, 119, 97, 101,
33 and 52 with a mean of 98.  10.7 cm flux was 148.1, 139.3, 132.7,
124, 115.9, 112.9 and 108.2, with a mean of 125.9, and estimated
planetary A indices were 7, 6, 6, 6, 3, 5 and 4, with a mean of 5.3.

Here are some path projections for this week from Chicago, Illinois:

To Western Europe, 80 meters 2300-0745z, 40 meters 2130-0900z, 30
meters 1900-0700z and 0930-1045z, 20 meters 1300-2330z, 17 meters
1330-2130z, 15 meters 1600-2000z.

To Eastern Europe, 80 meters 2330-0500z, 40 meters 2230-0600z, 30
meters 2030-0500z, 20 meters 1300-2130z, 17 meters 1500-1900z, 15
meters around 1800z.

To Southern Africa, 80 meters 2330-0430z, 40 meters 2300-0500z, 30
meters 2200-0530z, 20 meters 1900-0200z, 17 meters 1630-0000z, 15
meters 1600-2200z.

To the Caribbean, 80 meters 2330-1100z, 40 meters 2100-1330z, 30
meters 1130-0400z, 20 meters 1300-0100z, 17 meters 1700-2100z.

To South America, 80 meters 2330-1000z, 40 meters 2300-1030z, 30
meters 2200-1130z, 20 meters 1130-1500z and 1900-0400z, 17 meters
1200-0200z, 15 meters 1300-0100z, 12 meters 1600-2200z.

To Hawaii, 80 meters 0400-1230z, 40 meters 0300-1330z, 30 meters
1200-1400z, around 1530z and 0130-0800z, 20 meters 1600-0400z, 17
meters 1700-0200z, 15 meters 1800-0030z.

To the South Pacific, 80 meters 0530-1230z, 40 meters 0430-1300z, 30
meters 0330- 1400z, 20 meters 1300-1430z and 0100-0500z, 17 meters
1730-0300z and around 1330z, 15 meters 1730-0130z, 12 meters
1800-2300z.

To Australia, 80 meters 0730-1200z, 40 meters 0700-1300z, 30 meters
0600-1400z, 20 meters 1230-1600z and 0430-0630z, 17 meters
0200-0400z, 15 meters 2030-0200z, 12 meters 2100-0000z.

To Japan, 80 meters 0830-1215z, 40 meters 0800-1300z, 30 meters
1200-1430z and around 0730z, 20 meters 2030-0230z, 17 meters
2100-0100z, 15 meters 2130-2300z.

To Central Asia, 40 meters 2330-0100z, 30 meters 2200-0230z, 20
meters 1200-0230z, 17 meters 1500-1700z.
NNNN
/EX