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ARRL Propagation Bulletin ARLP048 (2006)

ARLP048 Propagation de K7RA

QST de W1AW  
Propagation Forecast Bulletin 48  ARLP048
From Tad Cook, K7RA
Seattle, WA  November 22, 2006
To all radio amateurs 

ARLP048 Propagation de K7RA

This is an early bulletin because of the Thanksgiving holiday, but
the timing is wrong for publishing another week of solar and
geomagnetic data, so the numbers at the bottom of this bulletin are
the same as in last week's Propagation Forecast Bulletin, ARLP047.
An additional bulletin will come out on Monday, November 27 with the
updated numbers.

Last weekend geomagnetic conditions were quiet for the ARRL Phone
Sweepstakes. But we are about to experience the effects of a solar
wind stream just before this next weekend's big contest, the CW
portion of the CQ Worldwide DX Contest. The planetary A index for
November 22-26 is predicted at 5, 10, 20, 15 and 10. Helioseismic
holography has detected the emergence of a new large sunspot on the
sun's far side.

Check "The World Above 50 MHz" column in the current (December 2006)
issue of QST for a good piece about "Solar Cycles and the Coming of
Cycle 24," part 1. It was written by Jim Kennedy, K6MIO of the
Gemini Observatory in Hilo, Hawaii, and gives good information on
the magnetic conveyor belt, solar magnetic fields, and a 22 year
solar magnetic cycle.

Brett Graham, VR2BG wrote from Hong Kong with some reports on
beacons he monitored recently on 12 meters at 24.93 MHz. He often
hears these from JA, VK, ZS and 4S, but at the same time hears
nobody on the band, even when he is monitoring the beacons operating
down to the milliwatt level. You can get information on the NCDXF
beacons at,

If you would like to make a comment or have a tip for our readers,
email the author at,

For more information concerning radio propagation, see the ARRL
Technical Information Service at, For a detailed
explanation of the numbers used in this bulletin see, An archive of past
propagation bulletins is at,

Sunspot numbers for November 9 through 15 were 29, 13, 13, 18, 30,
41 and 50 with a mean of 27.7. 10.7 cm flux was 89.4, 91.1, 97,
96.7, 95.2, 94.5, and 96.1, with a mean of 94.3. Estimated planetary
A indices were 10, 36, 20, 7, 2, 4 and 5 with a mean of 12.
Estimated mid-latitude A indices were 7, 29, 20, 9, 1, 3 and 6, with
a mean of 10.7.


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