[KCDXC] Fw: ARLP017 Propagation de K7VVV

[Steve Lufcy]

> Subject: ARLP017 Propagation de K7VVV
> 
> 
> > SB PROP @ ARL $ARLP017
> > ARLP017 Propagation de K7VVV
> > 
> > ZCZC AP17
> > QST de W1AW  
> > Propagation Forecast Bulletin 17  ARLP017
> > From Tad Cook, K7VVV
> > Seattle, WA  April 26, 2002
> > To all radio amateurs 
> > 
> > SB PROP ARL ARLP017
> > ARLP017 Propagation de K7VVV
> > 
> > Big news this week were the geomagnetic storms. Stormy conditions
> > reigned continuously from Wednesday through Saturday and the
> > geomagnetic indices rose again on Tuesday.
> > 
> > K9IIK wrote to say he thought something was wrong with his radio,
> > which is a common reaction when conditions are truly awful and HF
> > radio signals are either weak or never heard at all. A check of
> > geomagnetic data with a web browser pointing toward
> > gopher://solar.sec.noaa.gov/00/latest/DGD tells the story. Most HF
> > operators are comfortable when the A index is 10 or lower and the K
> > index is 3 or below.
> > 
> > K9IIK asked if this was a sign of things to come. It is true that
> > conditions are less stable after a peak in sunspot activity than
> > before, but conditions are bound to settle down. Currently it looks
> > like geomagnetic indices could rise again on Saturday, but to a
> > level indicating unsettled conditions rather than a storm.
> > 
> > Looking at the numbers, both sunspots and solar flux were lower this
> > week, with average sunspot numbers down nearly 38 points and average
> > daily solar flux off by over 28 points. Sunspot count and solar flux
> > reached a minimum on Monday and are on the way back up. Solar flux
> > is expected to return to 200 around May 1, and may peak around 215
> > May 4-5.
> > 
> > NN4X reports from Central Florida that Saturday morning had good
> > 6-meter conditions. Around 1500z he worked Europe on 6, and South
> > America was coming in around the same time. Stations local to him
> > reported loud and delayed echoes from each other's signals, to the
> > point that they could barely copy each other. About five hours later
> > there was an opening toward the Pacific.
> > 
> > W5XC near Houston reports that he worked FO3BM on April 18 at 1015z
> > on 6-meters. He recommends checking out the http://6m.dxers.info/
> > site during these openings.
> > 
> > WV1K writes from Massachusetts that real time data on D-region
> > absorption is at
> > http://www.sel.noaa.gov/rt_plots/dregion.html.  D-region
> > absorption is a major cause of attenuation of HF radio signals, and
> > a good treatise on this is can be found at
> > http://www.sel.noaa.gov/rt_plots/dregionDoc.html .
> > 
> > Sunspot numbers for April 18 through 24 were 160, 182, 185, 160,
> > 155, 180 and 256 with a mean of 182.6. 10.7 cm flux was 188.2,
> > 179.7, 177.3, 173.4, 169.9, 175.3 and 176.9, with a mean of 177.2,
> > and estimated planetary A indices were 54, 44, 62, 7, 12, 22 and 7
> > with a mean of 29.7.
> > NNNN
> > /EX
> > 
> > 
> 
>