Here’s the latest propagation forecast from Tad Cook (K7RA).
Views expressed in this Amateur/Ham Radio News update are those of the reporters and correspondents.
Content supplied by Tad Cook (K7RA), HQ ARRL, and W1AW.
Accessed on 22 August 2020, 0339 UTC, Post 1596.
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SB PROP @ ARL $ARLP034 ARLP034 Propagation de K7RA ZCZC AP34 QST de W1AW Propagation Forecast Bulletin 34 ARLP034 From Tad Cook, K7RA Seattle, WA August 21, 2020 To all radio amateurs SB PROP ARL ARLP034 ARLP034 Propagation de K7RA Sunspots disappeared during four days over the past week, but then came back. Average daily sunspot number declined from 14.3 to 5.4, while average daily solar flux went from 73.8 to 71. Geomagnetic indicators remain quiet. Average daily planetary A index increased from 3.7 to 4.4. Predicted solar flux is 70 on August 21 and 22, 69 on August 23 to 28, 72 on August 29, 73 on August 30 to September 5, 72 on September 6 to 9, 71 on September 10 and 11, 70 on September 12 to 19, 71 on September 20 o 23, 72 on September 24 and 25, 73 on September 26 to October 2, and 72 on October 3 and 4. Predicted planetary A index is 5 on August 21 and 22, 6 on August 23 to 25, 5 on August 26 to 28, 8, 16 and 8 on August 29 to 31, then 5 on September 1 to 14, 10 on September 15 and 16, 5 on September 17 to 24, then 8, 16 and 8 on September 25 to 27, and 5 on September 28 to October 4. Geomagnetic activity forecast for the period August 21 to September 16, 2020 from F. K. Janda, OK1HH. “Geomagnetic field will be Quiet on: September 5 to 7 Quiet to unsettled on: August 22, (23,) 24 and 25, (26 to 28,) September 2 to 4, 8 and 9 Quiet to active on: (August 21, 29 to 31, September 1, 16) Unsettled to active: not expected Active to disturbed: not expected Solar wind will intensify on: August (21 to 23,) 24 and 25, 29, September 1 and 2, (4 to 6,) 8, 15 and 16 Remarks: – Parenthesis means lower probability of activity enhancement.” – Next Geomagnetic activity forecast will be issued on 3rd September, so it must be time for OK1HH to take his annual vacation. Thanks to Max White for this link to an article about a dent in Earth’s magnetic field and the South Atlantic Anomaly: https://bit.ly/2Qbmw9R The latest report from Tamitha Skov, WX6SWW, the Space Weather Woman: https://youtu.be/GW4HOvejxFA The CME she spoke of turned out not to be geo-effective, so we missed a disturbance. From reader David Moore, info on the NASA THEMIS Mission: “A special type of aurora, draped east-west across the night sky like a glowing pearl necklace, is helping scientists better understand the science of auroras and their powerful drivers out in space.” https://bit.ly/2QeRU78 George Hall, N2CG wrote: “Reading The K7RA Solar Update 08/14/2020 issue of your personal experience of solar Cycle 19 when you were a young boy with your dad listening to the low band VHF FM 2-Way radio in your dad’s company car in California and suddenly hearing stations in Texas and other Midwestern states brought back fond memories of a similar nature I experienced in Solar Cycle 20. I was a Radioman on active duty in the USCG stationed at Coast Guard Radio Station NIK/NJN located on the U.S. Naval Air Station Argentia, Newfoundland CANADA. One day the Crash Crew (a fire department specifically devoted to incidents on the airport with specially equipped fire trucks that could literally drive right up on top of a fire on the ground and expel fire extinguishing foam from the underside of the crash crew trucks to put out the fire). The Crash Crew was a 24/7/365 operation and monitored the airport control tower’s VHF Low Band (I don’t remember the frequency but it was VHF Low Band between 30 to 49 MHz). One bright sunny early afternoon in June 1968 all of a sudden over the radio came the loud and clear call “ROLL THE GEAR” “ROLL THE GEAR” which is the highest response precedence for the Crash Crew to man the crash crew trucks and head for the airport crash site. So, without hesitation the Argentia Newfoundland Crash Crew immediately manned the crash crew trucks and headed for the airport except they saw no evidence of a crash. There was no smoke or fire. The senior on-scene crash crew member called the tower and asked if this was a drill? The tower replied they also heard the “ROLL THE GEAR” call but it was not them and for the crash crew to return to station. Later that day it was determined that the “ROLL THE GEAR” call was actually from the U.S. Naval Air Station in Rota, Spain, over 2,500 miles away! Both Argentia and Rota used the same VHF Low Band frequency. Thanks for bringing back the fond memories of over 52 years ago.” For more information concerning radio propagation, see http://www.arrl.org/propagation and 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/. Instructions for starting or ending email distribution of ARRL bulletins are at http://arrl.org/bulletins. Sunspot numbers for August 13 through 19, 2020 were 11, 0, 0, 0, 0, 12, and 15, with a mean of 5.4. 10.7 cm flux was 72.3, 70.8, 70.6, 70.9, 70.8, 71.3, and 70.5, with a mean of 71. Estimated planetary A indices were 4, 4, 3, 4, 3, 7, and 6, with a mean of 4.4. Middle latitude A index was 5, 3, 3, 5, 3, 7, and 9, with a mean of 5. NNNN /EX
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