ad7i (11/23/82)
qst de ad7i hr propagation forecast bulletin nr 47 from arrl headquarters newington ct movember 22, 1982 to all radio amateurs bt in the past week, the solar flux rose from 162 on the 17th to 206 on the 21st. this was the highest since october 1, and it was enough to push the f layer muf over 50 mhz. thus cycle 21 became the first solar cycle in which 50 mhz was open for f layer dx in four consecutive years. generally low geomagnetic activity made recent days notable for the excellent quality of hf propagation as well. the solar flux has been above readings for the previous solar rotation since november 5, and this will continue for a few more days. there was a major aurora the evening of november 21, degrading hf propi ion but providing an exceptional vhf auroral opening across northern usa and adjacent canadian areas. there will be more disturbances through november 29, but in between there will be good hf conditions and very likely more 50 mhz dx. at the end of november the solar flux and muf will be lower, but hf conditions will be good to excellent in early december. american sunspot numbers ranged from 93 on the 11th to 140 on the 17th, for a mean of 109 ar