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December 3, 1999
SEATTLE, WA, Dec 3, 1999--Sunspot numbers for November 25 through December 1 were 147, 143, 187, 173, 101, 127 and 119, with a mean of 185.4. Estimated planetary A indices for that same period were 18, 4, 3, 7, 4, 8 and 4, with a mean of 6.9. So while sunspot numbers were down, so was geomagnetic activity.
Solar activity is expected to rise over the next few days, with predicted solar flux for Friday through Sunday at 170, 180 and 190 and planetary A index at 5, 15 and 20. This does not look especially good for the ARRL 160-Meter Contest this weekend.
Solar flux should peak around 230 by December 9, then drop below 200 after December 18.
Next week's bulletin should have a listing for all recent solar flux numbers.
Amateur solar observer Tad Cook, K7VVV Seattle, Washington, provides this weekly report on solar conditions and propagation. This report also is available via W1AW every Friday, and an abbreviated version also appears in The ARRL Letter. Readers may contact the author via k7vvv@arrl.net.
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