rjr@mgweed.UUCP (Bob Roehrig) (06/19/84)
qst de k9eui hr propagation forecast bulletin nr 25 from arrl headquarters newington ct june 18, 1984 to all radio amateurs bt after several days of solar flux levels in the low 90s, solar activity began to rise on june 13. by the 15th, the flux was up to 114. the indications are for gradually lower readings during the forecast week and through the end of june. the level of geomagnetic activity is no (garbled copy here) in propagation factor at this season, especially in our northern states and adjacent areas. on this basis, fair to poor propagation is predicted through june 20, improving to fair to good through the 28th. the early part of the arrl fd weekend should have good summer conditions on our lower frequencies in areas not plagued by thunderstorms. the usefulness of ??? 28 and 50 mhz will depend to a large extent on sporadic e layer ionization which peaks in late june. short skip, often with high signal levels, can break out suddenly, so field day teams keep continuous watches on these bands, especially 28 and 50 mhz. e skip is most common in late morning and early evening hours, local time, but it can show up at any hour. stable, calm weather makes for above average signal levels and extended range on 50 mhz and higher frequencies. american sunspot numbers for june 7 through 13 were between 22 and 45 with a mean of 30.9 ar
rjr@mgweed.UUCP (Bob Roehrig) (06/26/84)
qst de k9eui hr propagation bulletin nr 25 from arrl headquarters newington ct june 18 1984 to all radio amateurs bt after several days of solar flux levels in the low 90s, solar activity began to rise on june 13. by the 15th, the flux was up to 114. present indications are for gradually lower readings during the forecast week and through the end of june. the level of geomagnetic activity is the main propagation factor at this season, especially in our northern states and adjacent areas. on this basis, fair to poor propagation is predicted through june 20, improving to fair to good through the 28th. the early part of the arrl fd weekend should have good summer conditions on our lower frequencies in areas not plagued by thunderstorms. the usefulness of 21, 28 and 50 mhz will depend to a large extent on sporadic e layer ionization which peaks in late june. short skip, often with high signal levels, can break out suddenly, so field day teams keep continuous watches on these bands, especially 28 and 50 mhz. e skip is most common in late morning and early evening hours local time, but it can show up at any hour. stable, calm weather makes for above average signal levels and extended range on 50 mhz and higher frequencies. american sunspot numbers for june 7 through 13 were between 22 and 45 with a mean of 30.9. ar
rjr@mgweed.UUCP (Bob Roehrig) (06/25/85)
qst de k9eui hr propagation forecast bulletin nr 25 from arrl headquarters newington ct june 24, 1985 to all radio amateurs bt there is much to be said for contests, especially the most popular of all, the arrl field day. generating band occupancy far beyond other contests, field day can be a two day lesson in radio propagation. if june 22 and 23 had been just another early summer weekend, would thousands of stations all over north america have been clamoring for attention on 21, 28 and 50 mhz? of course not, and this (( w1aw carrier dropped on 20 mtrs - switched to 15 mtrs))......... ten and six meters have had much less use than they merit, since solar flux and sunspot numbers dropped to near minimum levels months ago. the solar flux was 69 on field day saturday and 70 sunday, but e skip on these bands made this one of the most exciting field day weekends on record. the sun has been spotless for several days, and it is likely to continue that way through this week. a rise is expected near the end of june, but whether the numbers rise or fall, e skip will continue to dominate the propagation picture for another five or six weeks, and it is not predictable in any precise way ar