ARRL

ARRL Propagation Bulletin ARLP044 (1999)

SB PROP @ ARL $ARLP044
ARLP044 Propagation de K7VVV

ZCZC AP44
QST de W1AW  
Propagation Forecast Bulletin 44  ARLP044
From Tad Cook, K7VVV
Seattle, WA  October 29, 1999
To all radio amateurs 

SB PROP ARL ARLP044
ARLP044 Propagation de K7VVV

Solar flux and sunspot number averages were down a little this week,
although the numbers were starting to spike up again around
Wednesday.  Solar flux reached 197.3, and sunspot numbers were up to
200.  Too bad this was accompanied by high geomagnetic activity.
The planetary A index was 87 on Friday, with K indices up to 8.
This was a raging storm.

There has been a lot of anticipation for the CQ Worldwide DX Phone
Contest this weekend, and conditions could be a bit unsettled.  The
solar flux is expected to decrease over the next few days, with
Friday through Sunday values at 175, 165 and 160.  There is probably
more interest in predicted geomagnetic values, since a geomagnetic
storm is not much fun in an HF contest.  The Fredericksburg middle
latitude A index, which is close to the Boulder A index heard on
WWV, is predicted to be 20, 15 and 15, for Friday through Sunday.
The planetary A index is predicted to be 20, 20 and 15 for the same
period.

After the weekend, solar flux is expected to bottom out around 135
early next week, then rise again to 200 a week later.  The period
around November 6-10 looks stormy, with A indices as high as 25.

K7CAR wrote to relate some unusual conditions on 10 meters on
October 21.  He experienced a lot of auroral propagation, and in
addition to hearing distant stations quite well, he heard ones that
were less than 100 miles away quite strong also.  He has some nice
pictures of his antennas at
http://www.zing.com/cgi-bin/album.cgi?album_id=4294860361.

Sunspot numbers for October 21 through 27 were 154, 153, 114, 130,
179, 200 and 193 with a mean of 160.4.  10.7 cm flux was 158.5,
160.3, 164.5, 158.8, 179.2, 189.4 and 197.3, with a mean of 172.7,
and estimated planetary A indices were 15, 87, 26, 23, 18, 9 and 17,
with a mean of 27.9.

The path projection for this week is for the contest, and from the
center of the United States.

To Europe, 80 meters 2200-0930z, 40 meters 2030-1100z, 20 meters
1300-0030z, 15 meters 1400-2030z, 10 meters 1530-1800z.

To Southern Africa, 80 meters 2300-0400z, 40 meters 2200-0430z, 20
meters 2030-0330z, 15 meters 1330-2330z, gradually stronger later in
the period, 10 meters 1430-2100z.

To the Caribbean, 80 meters 2300-1100z, 40 meters 2100-1300z, 20
meters 1300-0100z, 15 meters 1430-2230z, 10 meters 1630- 2000z.

To South America, 80 meters 2330-0930z, 40 meters 2300-1000z, 20
meters 2130-1100z, 15 meters 1300-0100z, 10 meters 1400- 2300z.

To Australia, 80 meters 0900-1330z, 40 meters 0830-1430z, 20 meters
0700-1600z, 15 meters around 1530z, 10 meters 2230- 0030z.

To Japan, 80 meters 0700-1400z, 40 meters 0600-1500z, 20 meters
1400-1730z and 2000-0300z, 15 meters 2100-0130z, 10 meters
2200-2330z.
NNNN
/EX