ad7i (03/25/83)
qst de ad7i hr propagation forecast bulletin nr 12 from arrl headquarters newington ct march 21, 1983 to all radio amateurs bt solar flux information was not available in the 24 hours prior to preparation of this bulletin, but visual observation of the sun indicated that flux values are continuing a gradual rise that began march 14. the flux was estimated at 127 on the 20th, and a peak of about 140 is expected by march 27. the flux average for march 20 to 31 is expected to be above the 123 used in preparing the propagation charts in qst for march. geomagnetic activity was at intermediate levels and propagation waso fair to good through the 18th. it was higher, and conditions were degraded, march 19 and 20. propagation will remain below par through the 21st, but will improve thereafter, becoming good march 26 and 27. the month will close with erratic conditions carrying through april 2. communications over high latitude paths will be affected most adversely. transequatorial circuits may be enhanced, particularly on 28 and 50 mhz, the latter having been open to south america during march, especially from the southern tier of states. american sunspot numbers for march 10 through 16 were between 8 and 58 with a mean of 36.9 ar