[SFDXA] ARLP035 Propagation de K7RA

[William Marx]

> 
> 
> 
> SB PROP @ ARL $ARLP035
> ARLP035 Propagation de K7RA
> 
> ZCZC AP35
> QST de W1AW
> Propagation Forecast Bulletin 35 ARLP035
> From Tad Cook, K7RA
> Seattle, WA September 1, 2017
> To all radio amateurs
> 
> SB PROP ARL ARLP035
> ARLP035 Propagation de K7RA
> 
> A new video from Dr. Skov:
> 
> https://youtu.be/qvjfFpRMQpY
> 
> Average daily sunspot numbers and solar flux declined this week
> (August 24 to 30). Average daily sunspot number went from 39.9 to
> 33.3, while average daily solar flux declined to 81.2 from 84.6.
> 
> Average planetary A index declined from 23.1 to 7.1, and average
> mid-latitude A index went from 18.6 to 7.4.
> 
> The latest forecast shows planetary A index at 24, 16, 12 and 8 on
> September 1 to 4, 5 on September 5 and 6 then 8, 10 and 8 on
> September 7 to 9, 5 on September 10 to 12, 25 on September 13, 30 on
> September 14 and 15, then 25 and 12 on September 16 and 17, 8 on
> September 18 and 19, 5 on September 20 to 22, 10 on September 23 and
> 24, then 8, 15, 25, 18, 15 and 8 on September 25 to 30, then 5 on
> October 1 to 4, 10 and 8 on October 5 and 6, 5 on October 7 to 9, 25
> on October 10, 30 on October 11 and 12, then 25, 12 and 8 on October
> 13 to 15.
> 
> Predicted solar flux is 92 on September 1 and 2, 91 on September 3,
> 90 on September 4 to 7, 80 on September 8, 85 on September 9 to 14,
> 88 on September 15 to 18, 85 on September 19 and 20, then 82 and 80
> on September 21 and 22, and 78 on September 23 to 25, 77 and 75 on
> September 26 and 27, 74 on September 28 and 29, 72 on September 30
> through October 3, 75 and 80 on October 4 and 5, 85 on October 6 to
> 11 and 88 on October 12 and 15.
> 
> Geomagnetic activity forecast for the period September 1 to 27, 2017
> from OK1HH.
> 
> "Geomagnetic field will be:
> Quiet on September 10 and 11, 20 and 21
> Mostly quiet on September 4 to 6, 23, 26
> Quiet to unsettled September 3, 8 and 9, 19, 22, 27
> Quiet to active on September 2, 7, 12, 16 and 17, 24
> Active to disturbed on September 1, 13 to 15, 18, 25
> 
> Remark: Parenthesis means lower probability of activity enhancement
> and/or lower reliability of prediction."
> 
> For more information concerning radio propagation, see the ARRL
> Technical Information Service at
> http://arrl.org/propagation-of-rf-signals. For an explanation of
> 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. More good
> information and tutorials on propagation are at http://k9la.us/.
> 
> 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 August 24 to 30, 2017 were 43, 39, 35, 22, 17,
> 35, and 42, with a mean of 33.3. 10.7 cm flux was 78.8, 80.8, 77.5,
> 78.2, 81.6, 84.3, and 86.9, with a mean of 81.2. Estimated
> planetary A indices were 11, 5, 5, 10, 4, 10, and 5, with a mean of
> 7.1. Estimated mid-latitude A indices were 16, 7, 5, 6, 3, 10, and
> 5, with a mean of 7.4.
> NNNN
> /EX