[South Florida DX Association] ARLP016 Propagation de K7RA

[Bill Marx]

 SB PROP ARL ARLP016
> ARLP016 Propagation de K7RA
> 
> Little changed in sunspots and solar flux this week, but it was one
> of those periods were average daily sunspot numbers were up
> slightly, and average daily solar flux was down a little.  Average
> daily sunspot numbers were up over ten points to 50.9, and average
> daily solar flux was down five points to 81.9.
> 
> Geomagnetic conditions were calmer and quieter, with no really
> stormy days at all.  The most unsettled days saw planetary A index
> of 19 for April 14, while the mid-latitude A index was 14.  On April
> 20 the planetary A index was 21 and the mid-latitude A index was 12.
> 
> No large sunspots are detected on the sun's far side, and the
> projection for the next week is for more of the same in terms of
> solar flux and sunspot numbers.  April 25-28 could see a slight rise
> in sunspot count.  April 22-23 could produce some unsettled
> geomagnetic conditions if the interplanetary magnetic field turns
> south.  Currently as this bulletin is written early Friday, the
> field points north, tending to deflect any solar wind.  While there
> isn't much in the way of sunspots, at least conditions are quiet and
> there is more sunlight for those of us in the Northern Hemisphere.
> 
> Randy Crews, W7TJ of Spokane, Washington sent a note in response to
> last week's bulletin mentioning 160 meter propagation.  He writes,
> ''Here is one of the best articles on 160M Propagation I have read.''
> The article appeared in CQ Magazine in 1998.  Read it at
> http://solar.spacew.com/cq/cqmar98.pdf.  Thanks to Randy for sharing
> it with us.
> 
> 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.  An archive of past
> bulletins is found at http://www.arrl.org/w1aw/prop/.
> 
> Sunspot numbers for April 14 through 20 were 63, 61, 52, 54, 44, 43
> and 39 with a mean of 50.9. 10.7 cm flux was 85.4, 84.9, 82.9, 83.6,
> 81.3, 78.2 and 77, with a mean of 81.9. Estimated planetary A
> indices were 19, 13, 7, 5, 8, 8 and 21 with a mean of 11.6.
> Estimated mid-latitude A indices were 14, 7, 4, 4, 5, 6 and 12, with
> a mean of 7.4.
> NNNN
> /EX
>