ARLP049 Propagation de K7VVV:
December 4, 1998

Propagation Forecast Bulletin 49 ARLP049
From Tad Cook, K7VVV
Seattle, WA December 4, 1998
To all radio amateurs

ARLP049 Propagation de K7VVV

HF radio conditions were good over the past week, with moderate geomagnetic conditions and a rising solar flux. Sunspot averages for the week were more than double the week before, and average solar flux was up over thirty points. The high point for the week was on Sunday, when solar flux reached 167.8, which was the highest it's been since the beginning of September. Average solar flux for the previous ninety days was 131 and 132, and solar flux was above this level on every day, indicating an upward trend.

Now that November has passed, we can see that solar activity is back up, after a dip in October. Monthly average solar flux for June through November was 108.5, 114.1, 136, 137.7, 117.3 and 138.8.

For the next three days, Friday through Sunday, look for a solar flux of 150, 148 and 148 with a planetary A index around 10 for all days. After the weekend solar flux should dip just below 130 around December 9, then bounce around between 130 and 135 until December 17. From December 18 until December 27 flux values should rise to around 150.

N7SO writes to remind us of the NASA Space Weather Bureau website at There is a lot of data on current conditions, as well as a great 10 day animation of the sun at Don't miss the current image of the aurora updated every seven minutes, as well as information on solar flares.

Sunspot Numbers for November 26 through December 2 were 132, 121, 110, 126, 186, 153 and 144 with a mean of 138.9. 10.7 cm flux was 156.4, 158.9, 164.8, 167.8, 163.4, 162.7 and 151.7, with a mean of 160.8, and estimated planetary A indices were 11, 8, 5, 6, 13, 13 and 4, with a mean of 8.6.