[South Florida DX Association] ARLP010 Propagation de K7RA

[Bill Marx]

 SB PROP ARL ARLP010
> ARLP010 Propagation de K7RA
> 
> The sun was quiet this week, but a new chain of sunspots is rotating
> into a geo-effective position. There were some active days for
> geomagnetic conditions, most pronounced on March 6-8, and due to a
> solar wind stream. The average daily planetary A index rose less
> than 11 points to 20.1, and the average mid latitude A index rose
> less than 6 points to 12.3. Average daily sunspot numbers were up
> over 21 points to 36.1, and average daily solar flux rose less than
> 10 points to 85.9
> 
> Rising solar flux and increasing sunspots are expected over the next
> week. Solar flux should peak around March 15-16 near 115, then drop
> below 100 around March 20. The most active predicted geomagnetic day
> in the near term is March 14, but conditions should be merely
> unsettled, rather than stormy.
> 
> Enjoy the next few weeks. The period around the equinox, the change
> from winter to spring is a good time for HF propagation, even with
> the sunspot count so low.
> 
> With a cry of "Say it isn't so!" Vince Varnas, W7FA of Aloha, Oregon
> sent an article claiming that the next solar cycle, set to begin in
> a few years, may turn out to have the weakest maximum of any cycle
> in the past 100 years. He sent the article as an attachment, but I
> found it online at, http://solar.uleth.ca/news/05Mar2005/index.php.
> If that link is troublesome, try a cached version at
> http://tinyurl.com/4j8cw.
> 
> Let's hope the next one, Cycle 24, proves this forecasting method
> wrong. We don't see many solar cycles in our lifetimes, not to
> mention our time as amateur radio operators. I was lucky to start
> early at age 12, 40 years ago this month, and am in my 4th solar
> cycle. I was just young enough to have missed cycle 19, the grandest
> of them all, which peaked after the middle of the last century in
> the late 1950s.
> 
> Alex Mendelsohn, AI2Q of Kennebunk, Maine sent in a link to an
> interesting article from the Air Force Research Laboratory magazine
> about an all-sky imager that detects solar plasma clouds. You can
> read it at http://www.afrlhorizons.com/Briefs/Dec04/VS0402.html.
> Even better, check out Alex's own radio room and some very
> impressive homebrew projects on his personal web site at
> http://users.adelphia.net/~alexmm/ai2q.htm.
> 
> If you would like to comment or have a tip, email the author at,
> k7ra at arrl.net.
> 
> For more information concerning radio 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 March 3 through 9 were 24, 13, 22, 22, 43, 52
> and 77 with a mean of 36.1. 10.7 cm flux was 77, 78.9, 81.2, 83.6,
> 87, 93.5 and 99.9, with a mean of 85.9. Estimated planetary A
> indices were 4, 3, 10, 36, 42, 26 and 20 with a mean of 20.1.
> Estimated mid-latitude A indices were 2, 1, 8, 17, 28, 17 and 13,
> with a mean of 12.3.
> NNNN
> /EX
> 
>