[South Florida DX Association] ARLP029 Propagation de K7RA

[Bill Marx]

 > SB PROP ARL ARLP029
> ARLP029 Propagation de K7RA
> 
> We're putting out this bulletin a day early this week.  K7RA will be
> out of town, and Carl Luetzelschwab, K9LA, who often writes the
> bulletin in K7RA's absence, is giving a talk on 160-Meter
> propagation over the weekend at the Pacific Northwest DX Convention,
> near Seattle.  See http://www.wwdxc.org and specifically
> http://www.wwdxc.org/convention/2004conv.htm for information.
> 
> Carl wrote a great piece for the propagation section of the ARRL
> Technical Information Service site, which is reached via the URL at
> the end of this bulletin.  Titled "Propagation Planning for
> DXpeditions," it is good reading for anyone interested in the
> practical applications of HF propagation.  The direct link to his
> article is, http://www.arrl.org/tis/info/pdf/propplan.pdf.  You will
> need Adobe Reader to view the article.
> 
> Sunspot numbers and solar flux rose this week.  Average daily
> sunspot numbers were up 54 points above last week's average.
> Sunspot 649, a big one, came around the sun's eastern limb this
> week.  Helioseismic holography shows more sunspots on the far side
> of the sun, so the short-term trend for solar activity is up.
> 
> Big news is a huge X-class solar flare that was detected at 0140z on
> July 15.  If a coronal mass ejection is heading toward earth, it
> could mean big geomagnetic storms.  Currently the prediction made
> before the flare was for planetary A index of 12, 20, 12 and 10 for
> Thursday through Sunday, July 15-18.  Predicted solar flux for the
> same period is 140, 140, 135 and 135.
> 
> Several readers sent in articles this week about solar storms last
> October and how the effects are still being felt at the edge of our
> solar system.  The Washington Post ran an article about it last
> week, which you can read on the web at,
> http://www.washingtonpost.com/ac2/wp-dyn/A37614-2004Jul8?language=printe
> r.
> 
> For more information concerning 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.
> 
> Sunspot numbers for July 8 through 14 were 17, 32, 58, 98, 118, 129
> and 149 with a mean of 85.9.  10.7 cm flux was 81.8, 86.7, 93.3,
> 104.4, 125, 149.5 and 138.1, with a mean of 111.3.  Estimated
> planetary A indices were 5, 5, 8, 14, 13, 16 and 9, with a mean of
> 10.  Estimated mid-latitude A indices were 1, 4, 5, 13, 12, 11 and
> 6, with a mean of 7.4.
> NNNN
> /EX
> 
> 
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