[SFDXA] ARLP032 Propagation de K7RA

Fri Aug 9 18:17:04 EDT 2019

> ZCZC AP32
> QST de W1AW  
> Propagation Forecast Bulletin 32  ARLP032
> From Tad Cook, K7RA
> Seattle, WA  August 9, 2019
> To all radio amateurs 
> 
> SB PROP ARL ARLP032
> ARLP032 Propagation de K7RA
> 
> A new sunspot group appeared only briefly this week, on August 7 and
> 8.  It was sunspot 2747, from current cycle 24.  Sunspot numbers on
> Monday and Tuesday were 11 and 12.
> 
> Average daily solar flux shifted only slightly from last week, from
> 67 to 67.2.  Average planetary A index, a geomagnetic indicator
> aggregated from magnetometers around the world, more than doubled,
> from 5 to 10.3.  This was due to solar wind which raised the
> planetary A index to 35 on Monday.  Alaska's high latitude college A
> index reached 61 on Monday and 24 on Tuesday.
> 
> Predicted solar flux is 68 on August 9 to 16 and 67 on August 17
> through September 22.
> 
> Predicted planetary A index is 5 on August 9, then 8 on August 10
> and 11, 5 on August 12 to 16, 8 on August 17 and 18, 5 on August 19
> to 25, 8 on August 26 to 28, 5 on August 29 and 30, then 12, 25, 25,
> 16 and 8 on August 31 through September 4, then 5, 8 and 8 on
> September 5 to 7, 5 on September 8 to 12, 8 on September 13 and 14,
> then 5 on September 15 to 21 and 8 on September 22.
> 
> OK1HH sent his geomagnetic activity forecast for the period August 9
> to September 4, 2019, a day early this week.  There will be no
> forecast from him next week.
> 
> "Geomagnetic field will be 
> Quiet on: August 12, 16, 21, September 4 
> Quiet to unsettled on: August 9, 13 to 15, 17, 22, 29 and 30, September 3
> Quiet to active on: August 10 (- 11,) 19 and 20, 23 to 25, 28, 31 
> Unsettled to active on: August (18, 26 to 28), September 1, (-2) 
> Active to disturbed- none 
> 
> Solar wind will intensify on: August (9 to 14,) 27 to 29, (30 and
> 31, September 1 and 2)
> 
> - Parenthesis means lower probability of activity enhancement. 
> - Next forecast will be issued on August 22" 
> 
> Dr. Tamitha Skov, WX6SWW posted a new 3-hour (!) long space weather
> mini-course a few days ago:
> 
> https://youtu.be/56oVhXD7AZE 
> 
> Here is her report from August 8: 
> 
> https://youtu.be/a3hiGPOHZ-U 
> 
> Tamitha will be one of the speakers this Saturday at the Pacific
> Northwest DX Convention, along with Joe Taylor, K1JT:
> 
> https://pacificnwdxconvention.com/ 
> 
> Mark, K4SO in Virginia wrote on August 8: 
> 
> "My friend and neighbor, K1HTV, suggested I drop you a note about a
> brief, surprising opening on 10M this morning.
> 
> I had my small tribander (A3S) almost due north, and decided to drop
> down from 6M to 10M, on the way down to more 'active bands.'  JTDX
> was running, as usual, when I got a JTAlert audio message 'DX' and
> looked to find a decode of RV0AR, calling CQ SA.  I assumed it was a
> broken decode of some noise, but the next cycle it changed to CQ NA.
> I started calling with 100W, and turned on my Alpha 89, which
> features 'the longest 3 minutes in ham radio' while the filaments
> warm up.
> 
> I used JTAlert's text function to encourage to ask him to keep
> calling, but no indication he was online.  That is, by the way, an
> underutilized service.  Anyway, luckily for me, his signal continued
> to build as the tubes warmed up.
> 
> I wondered if he was telling his local ham friends, 'Hey I just
> worked NA.' (in Russian of course, hi.)"
> 
> Mike, KA3JAW likes to monitor various VHF services, such as FM
> broadcast, for sporadic-e.  He forwarded a report from William
> Hepburn in Grimsby, Ontario Canada who monitored over 45 minutes of
> e-skip from 162 MHz weather radio broadcasts from eight stations in
> Kansas, Arkansas, Colorado and Oklahoma from 2:19 PM to 3:06 PM
> local time back on July 20.  Distances ranged from 839 to 1,253
> miles.
> 
> 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
> 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.
> 
> Sunspot numbers for August 1 through 7, 2019 were 0, 0, 0, 0, 12,
> 11, and 0, with a mean of 3.3.  10.7 cm flux was 66.8, 66.9, 65.7,
> 66.9, 68.1, 68.1, and 68, with a mean of 67.2.  Estimated planetary
> A indices were 8, 4, 3, 4, 35, 12, and 6 with a mean of 10.3.
> Middle latitude A index was 8, 4, 4, 6, 20, 10, and 6, with a mean
> of 8.3.
> NNNN
> /EX