ARLP017 Propagation de K7VVV:
April 28, 2000

SB PROP @ ARL $ARLP017
ARLP017 Propagation de K7VVV
QST de W1AW
Propagation Forecast Bulletin 17 ARLP017
From Tad Cook, K7VVV
Seattle, WA April 28, 2000
To all radio amateurs

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.