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- SB PROP @ ARL $ARLP014
- ARLP014 Propagation de KT7H
-
- ZCZC AP28
- QST de W1AW
- Propagation Forecast Bulletin 14 ARLP014
- >From Tad Cook, KT7H
- Seattle, WA April 8, 1994
- To all radio amateurs
-
- SB PROP ARL ARLP014
- ARLP014 Propagation de KT7H
-
- This was a terrible week for propagation. There were several days
- with no visible sunspots, the solar flux was down about ten points
- from the previous week, and the geomagnetic field was very active.
- K indices were at four or five most of the time. Probably the worst
- day was April 3 when the A index was 48.
-
- The K index is updated every three hours, and can be monitored on
- WWV at 18 minutes after each hour, along with the A index and Solar
- Flux. The WWV propagation broadcast can also be heard over the
- telephone any time at 303-497-3235.
-
- The K index is an indicator of stability of the Earth's geomagnetic
- field. A single point change in the K index is quite significant.
- Values below three indicate generally good conditions, while above
- three means that conditions are difficult. A K index of five is
- quite bad.
-
- The A index is updated once per day, and is based on the K indices
- for the previous 24 hours. A one point change in the A index is not
- very significant. Generally values below ten indicate good
- conditions, and above ten indicates a poorer outlook.
-
- Look for active geomagnetic conditions to continue for the next
- week. Solar flux should rise slowly to peak above 100 around April
- 19 or 20. A indices may not calm down to stable levels until after
- April 21. Then look for more stormy conditions as old problem areas
- on the Sun rotate back into view around the end of the month.
-
- Sunspot Numbers from March 31 through April 6 were 61, 28, 0, 0, 0,
- 11 and 0, with a mean of 14.3. 10.7 cm flux was 85, 82.5, 79.3,
- 77.4, 77.1, 77.1 and 73.2, with a mean of 78.8.
-
- The path projection for this week is from Salt Lake City to
- Honolulu.
-
- 80 meters looks good from 0430 to 1400z, peaking from 0630 to 1230.
- 40 meters should be open from 0300 to 1400, with the best conditions
- from 0500 to 1300. 30 meters should be good from 0100 to 0830 and
- again from 1600 to 1800. Check 20 meters from 1630 to 0700, with
- the best period from 0400 to 0630. 17 meters should be open from
- 1900 to 0330. 15 meters from 2100 to 0000, and on some days as
- early as 1900 and as late as 0200. 12 and 10 meters do not look
- good, but on some days 12 meters may be open from 2030 to 0100.
- NNNN
- /EX
-
-