QST de W1AW
> Propagation Forecast Bulletin 22 ARLP022
> From Tad Cook, K7VVV
> Seattle, WA May 31, 2002
> To all radio amateurs
> SB PROP ARL ARLP022
> ARLP022 Propagation de K7VVV
> Average daily solar flux and sunspot numbers rose this week.
> Compared to last week (the reporting week for this bulletin is
> Thursday through Wednesday) average daily sunspot numbers were up
> nearly 65 points and daily solar flux was up by 15. There were some
> very active geomagnetic days. Monday, May 27 was quite active with
> the planetary A index at 28, and Thursday, May 23 was very stormy
> with an A index of 54. Thursday's problems were probably from
> several coronal mass ejections the day before.
> Solar flux is expected to fade a bit this week, and may reach a
> short-term minimum around Monday or Tuesday.
> There is a new large sunspot on the southeast limb of the sun.
> Region 9973 could bring solar flares.
> We're moving out of spring propagation and toward summer conditions.
> 10-meters is going out of season, and moving into summer will see
> lower MUF, affecting propagation on 15-meters. 17 and 20-meters will
> be the best summertime bands for HF DX, with 20-meters offering the
> best conditions right after sunrise or into the evening, rather than
> mid day.
> Sunspot numbers for May 23 through 29 were 229, 242, 221, 232, 227,
> 218, and 206, with a mean of 225. 10.7 cm flux was 180.3, 189.1,
> 182.6, 183.1, 186.7, 186.4, and 184.8, with a mean of 184.7.
> Estimated planetary A indices were 54, 7, 6, 10, 28, 12, and 12,
> with a mean of 18.4.
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