[South Florida DX Association] Fw: ARLP022 Propagation de K7RA

[Bill Marx]

> QST de W1AW  
> Propagation Forecast Bulletin 22  ARLP022
> From Tad Cook, K7RA
> Seattle, WA  May 28, 2004
> To all radio amateurs 
> 
> SB PROP ARL ARLP022
> ARLP022 Propagation de K7RA
> 
> Conditions weren't bad this week. Average daily sunspot numbers were
> down about 13 points and average daily solar flux was off about 6
> points. There were no major geomagnetic disruptions. Last Friday,
> May 21, we were within a solar wind stream, but this was not enough
> to cause any geomagnetic storms.
> 
> Sunspot group 618 was just emerging from the sun's eastern limb.
> 618 continued to grow, and was in the center of the solar disk on
> Wednesday, May 26. Eventually it grew to about 120,000 km (almost
> 75,000 miles) across. There is a small chance it may cause a
> geomagnetic disturbance, but day by day it will rotate off the sun's
> western limb.
> 
> This weekend is the CQ World Wide WPX CW Contest. I had a lot more
> fun in this contest back when I held KT7H, a far less common prefix
> than K7RA, the current call sign. This weekend shouldn't be too bad.
> Solar flux is expected to remain around 100. The predicted planetary
> A index for Friday through Monday, May 28-31 is 10, 10, 12 and 15.
> Predicted solar flux for the same days is 100, 100, 105 and 105.
> Currently holographic helioseismic imaging reveals another sunspot
> group on the sun's far side, so perhaps activity will remain at the
> current moderate levels.
> 
> One cautionary note from the Australian Space Weather Agency was
> issued at 2236z on May 27. It warns of possible increased
> geomagnetic activity due to a solar wind stream from a coronal hole
> around Jun 1-3. Of course, HF operators want lots of sunspots and
> quiet geomagnetic conditions, which often don't appear at the same
> time.
> 
> For more information concerning 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 May 20 through 26 were 109, 82, 79, 127, 118,
> 101 and 89 with a mean of 100.7. 10.7 cm flux was 104.6, 106.9,
> 102.4, 104, 105.2, 102.4 and 103.3, with a mean of 104.1. Estimated
> planetary A indices were 13, 10, 11, 12, 11, 8 and 6, with a mean of
> 10.1. Estimated mid-latitude A indices were 11, 6, 7, 9, 8, 5 and 3,
> with a mean of 7.
> NNNN
> /EX
> 
> 
>