[SFDXA] ARLP031 Propagation de K7RA

[Bill Marx]

> SB PROP @ ARL $ARLP031
> ARLP031 Propagation de K7RA
> 
> ZCZC AP32
> QST de W1AW  
> Propagation Forecast Bulletin 31  ARLP031
> From Tad Cook, K7RA
> Seattle, WA  August 3, 2012
> To all radio amateurs 
> 
> SB PROP ARL ARLP031
> ARLP031 Propagation de K7RA
> 
> Average daily sunspot numbers this week were up over 47 points to
> 99.3.  Average daily solar flux rose nearly 35 points to 131.7.
> 
> Solar flux jumped from 139.8 on Tuesday, July 31 to 150.1 on
> Wednesday, August 1.  Predicted solar flux is 135 on August 3-4, 130
> on August 5-6, 125 on August 7-9, 130 on August 10-11, and 120 on
> August 12-13.  Solar flux is expected to drop below 100 on August
> 16-21.  Predicted planetary A index is 8 on August 3, 5 on August
> 4-19, 8 on August 20-21, 5 on August 22-23, then 8, 8, 12 and 8 on
> August 24-27.
> 
> At the beginning of August we have some new sunspot data from our
> 3-month moving average.  The three-month moving averages centered on
> January through June 2012 are 83.3, 73.7, 71.2, 87.3, 91.5, and
> 96.5.  The average centered on June 2012 is every daily sunspot
> number from May 1 through July 31 added together, then divided by
> the number of days, which is 92.  You could say that this latest
> number is the 3-month trailing average, or the 3-month average
> centered on June.  Every month we include a new month of data and
> drop off an old month.
> 
> F.K. Janda, OK1HH says to expect mostly quiet geomagnetic conditions
> on August 3-4, active to disturbed on August 5, quiet to unsettled
> August 6-7, mostly quiet August 8, quiet on August 9, active to
> disturbed again on August 10-11, quiet to active August 12-13,
> mostly quiet on August 14-15, and quiet to active on August 16-17.
> 
> On the NASA Solar Cycle Prediction page, the only thing that has
> changed over the past few months is the date.  This is issued
> monthly: http://solarscience.msfc.nasa.gov/predict.shtml.
> 
> If you would like to make a comment or have a tip for our readers,
> email the author at, k7ra at arrl.net.
> 
> For more information concerning radio propagation, see the ARRL
> Technical Information Service at
> http://arrl.org/propagation-of-rf-signals.  For an explanation of
> the numbers used in this bulletin, see
> http://arrl.org/the-sun-the-earth-the-ionosphere.  An archive of
> past propagation bulletins is at
> http://arrl.org/w1aw-bulletins-archive-propagation.  Find more good
> information and tutorials on propagation at
> http://myplace.frontier.com/~k9la/.
> 
> Monthly propagation charts between four USA regions and twelve
> overseas locations are at http://arrl.org/propagation.
> 
> Instructions for starting or ending email distribution of ARRL
> bulletins are at http://arrl.org/bulletins.
> 
> Sunspot numbers for July 26 through August 1 were 77, 91, 108, 79,
> 106, 116, and 118, with a mean of 99.3.  10.7 cm flux was 114.7,
> 123.3, 126.6, 131.4, 136, 139.8, and 150.1, with a mean of 131.7.
> Estimated planetary A indices were 4, 5, 11, 6, 13, 6, and 6, with a
> mean of 7.3.  Estimated mid-latitude A indices were 3, 5, 11, 6, 11,
> 5, and 7 with a mean of 6.9.
> NNNN
> /EX