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ARRL Propagation Bulletin ARLP018 (2004)

ARLP018 Propagation de K9LA

QST de W1AW  
Propagation Forecast Bulletin 18  ARLP018
From Carl Luetzelschwab, K9LA
Ft Wayne, IN  April 30, 2004
To all radio amateurs 

ARLP018 Propagation de K9LA

Carl Luetzelschwab, K9LA, is filling in this week for Tad Cook,
K7RA. Tad had some windstorm damage at his QTH from a fallen tree,
and at the time of this writing he is without electricity and phone

This report covers the period Friday April 23 through Thursday April

Solar activity was at moderate levels at the beginning of the
period, with several M1 and M2 class flares. Solar activity
decreased to low levels in the latter half of the reporting period.
Solar activity is forecast to be low for the next several days.

Geophysical activity ranged from quite to active levels during the
reporting period due to several isolated active periods occurring at
high latitudes. The geomagnetic field is expected to be at an active
level on Friday, and return to quiet to unsettled levels on Saturday
and Sunday.

The VOACAP and W6ELProp tutorials mentioned in last week's bulletin
are intended to be introductory-level discussions of these readily
available software packages. Both of the tutorials show how to
download the software and set up the options. A sample prediction is
run in each, and the outputs are discussed.

For those interested in a more in-depth look at VOACAP, check out
"What Is VOACAP Trying to Tell Me?" by N6BV and "VOACAP Quick Guide"
by OH6BG - both of these are on the ARRL Technical Information
Service propagation page at,

As Cycle 23 continues its descent (the smoothed sunspot number for
May is predicted to be around 35 - a far cry from the peak of 121 in
April 2000), 10-meter aficionados are becoming more and more
dejected. On the other hand, 160-meter aficionados are perking up as
solar minimum approaches.

If you're interested in 160-meter propagation and are going to
Dayton, check out the Topband Dinner on Friday night (contact
George, W8UVZ, via email at, for more
information).  Eric, K3NA, will give a program about the 3B9C
160-meter QSOs.

The numbers for this week will be in next week's Propagation
Forecast Bulletin.


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