[South Florida DX Association] ARLP021 Propagation de K7RA

[Bill Marx]

 SB PROP @ ARL $ARLP021
> ARLP021 Propagation de K7RA
> 
> ZCZC AP21
> QST de W1AW  
> Propagation Forecast Bulletin 21  ARLP021
> From Tad Cook, K7RA
> Seattle, WA  May 19, 2005
> To all radio amateurs 
> 
> SB PROP ARL ARLP021
> ARLP021 Propagation de K7RA
> 
> There was so much remarkable solar and geomagnetic activity over the
> last weekend that we put out a special bulletin Sunday night. If you
> missed it, find it at http://www.arrl.org/w1aw/prop/, which has an
> archive of past propagation bulletins.
> 
> The last bulletin reported a TV DXer in Florida who copied a channel
> 2 television broadcaster in Iowa. Bill Smith, W0WOI of Jefferson,
> Iowa wrote to say that the TV DX was probably due to sporadic-E
> skip. This is propagation through the E layer of the ionosphere
> (lower than the F layers) that occurs in May, June and early July,
> and is responsible for a many 6 and 10 meter openings, even when
> there aren't many sunspots.
> 
> Bill said that KGAN "is one of the more frequently reported stations
> nationwide due to its geographical location and channel 2 frequency,
> just above 6 meters." By the way, Bill is the former editor of "The
> World Above 50 MHz," the monthly column devoted to VHF in QST.
> 
> Ray Bass, W7YKN in Sparks, Nevada reports that last Friday he was
> working W7QCY in Portland, Oregon on 40 meters, and around 9:40 AM
> local time signals started to fade. A few minutes later, the band
> was completely dead, no doubt due to the effects of the coronal mass
> ejection.
> 
> Dave Greer, N4KZ in Frankfort, Kentucky wrote that Tuesday, May 17
> was a very interesting day for 6 meter fans. He worked stations all
> over South and Central America as well as the Caribbean (LU, CX, TI,
> VP5, ZF, HK) from late afternoon into evening. He said there were
> many strong signals, but for some stations the conditions weren't
> reciprocal. He heard HK3JRL in Bogota call CQ repeatedly with no
> answer to responses. He heard a number of YV and KP4 stations that
> he could not work.
> 
> Reviewing numbers from the past week, solar flux and sunspot numbers
> were lower than the week before, and of course the big excitement
> was May 15 when the planetary A index reached 105. For the next week
> expect low solar flux and sunspot activity. Sunspot 759, the source
> of all the excitement, is passing off the solar disk.  Geomagnetic
> conditions should be unsettled for Thursday and Friday, May 19 and
> 20, but expect quiet conditions after that. Recurring coronal holes
> could produce active geomagnetic conditions around May 27 or 28.
> 
> If you would like to comment or have a tip, email the author at,
> k7ra at arrl.net.
> 
> For more information concerning radio propagation and an explanation
> of the numbers used in this bulletin see the ARRL Technical
> Information Service propagation page at,
> http://www.arrl.org/tis/info/propagation.html. An archive of past
> bulletins is found at, http://www.arrl.org/w1aw/prop/.
> 
> Sunspot numbers for May 12 through 18 were 110, 100, 91, 69, 70, 45
> and 46 with a mean of 75.9. 10.7 cm flux was 117.4, 125.9, 99.5,
> 103, 99.1, 90 and 83.8, with a mean of 102.7. Estimated planetary A
> indices were 17, 27, 8, 105, 33, 19 and 13 with a mean of 31.7.
> Estimated mid-latitude A indices were 13, 21, 4, 44, 18, 10 and 6,
> with a mean of 16.6.
> NNNN
> /EX
>