ARRL

ARRL Propagation Bulletin ARLP004 (2003)

SB PROP @ ARL $ARLP004
ARLP004 Propagation de K7VVV

ZCZC AP04
QST de W1AW  
Propagation Forecast Bulletin 4  ARLP004
From Tad Cook, K7VVV
Seattle, WA  January 24, 2003
To all radio amateurs 

SB PROP ARL ARLP004
ARLP004 Propagation de K7VVV

Daily sunspot numbers and solar flux were down again this week.
Average daily sunspot numbers for the week were down by over 43
points and average daily solar flux dropped by more than 37 points.
Current geomagnetic conditions are unsettled to active, with the
planetary A index for the past four days of the reporting period
(through January 22) at 16, 17, 17 and 17. On Thursday it rose to
19, and it should stay unsettled for a few more days. The planetary
A index for Friday through Monday is predicted at 20, 15, 20 and 15.

Solar flux should decline for a few more days. Flux values predicted
for Friday through Monday are 135, 130, 125 and 125.  Sunday and
Monday should have the minimum solar flux and sunspot numbers for
the near term, and then are expected to rise to a short-term peak
around February 6 or 7.

Jim Tabor, KU5S sends along an offer to try a neat new program he's
written for Windows. The program automatically checks current solar
flux, sunspot, A index and K index numbers over the internet and
displays them along with one-word summaries of solar and geomagnetic
activity over the past 24 hours and the next 24 hours in a little
window on your PC desktop. 

It is called Geo-Alert Wizard, and is available for free trial with
a license that expires May 20. You can download it at
http://www.taborsoft.com . Check out other tools that Jim has for
radio propagation, and don't miss an article about Ioncap
propagation software at http://www.taborsoft.com/w0omi/w0omi.shtml .
Also check out Jim's personal web site at
http://www.wtrt.net/~ku5s/ .

Sunspot numbers for January 16 through 22 were 135, 150, 148, 168,
184, 167, and 152, with a mean of 157.7. 10.7 cm flux was 144.6,
141.7, 137.4, 130.2, 138, 133.6, and 129.5, with a mean of 136.4.
Estimated planetary A indices were 7, 8, 12, 16, 17, 17, and 17,
with a mean of 13.4.
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/EX