ARRL Propagation Bulletin ARLP047 (2011)

ARLP047 Propagation de K7RA

QST de W1AW  
Propagation Forecast Bulletin 47  ARLP047
From Tad Cook, K7RA
Seattle, WA  November 23, 2011
To all radio amateurs 

ARLP047 Propagation de K7RA

Due to the Thanksgiving holiday tomorrow, the bulletin is coming out
two days early this week.  There is an overlap of one day on the
data reported at the end of the bulletin. Look for another bulletin
on Monday which will have more overlap, and Propagation Forecast
Bulletin ARLP049 a week from Friday will have still more overlap.
This is because the end of the bulletin always has seven days of
data, to keep it compatible with the Solar Data Plotting Utility
created by Scott Craig, WA4TTK. You can download the utility for
free at The Utility can handle
redundant data, but it must remain in a certain format in order for
it to glean data from the bulletin automatically.

Not much in the way of solar excitement this week, except there are
many sunspots, but the solar activity in terms of flares or coronal
mass ejections is low. The overlapping (by one day) average sunspot
numbers in this bulletin declined 21 points to 124

Expect good conditions for the CW weekend of the CQ Worldwide DX
Contest, November 26-27.

The latest prediction from USAF/NOAA shows solar flux at 140 on
November 23, 145 on November 24-27, 150 on November 28-29, 155 on
November 30, 160 December 1-2, and 165 December 3-7.  Predicted
planetary A index is 5 on November 23-27, 7 on November 28-29, then
5 on November 30 to December 24.

Larry Goolsby, AA4JI of Fayetteville, Tennessee wrote on November
18: "This whole week on forty meters during the Triple H Net on
7.190 at 0700 UTC I and others have been working central Australia
with strong 57 reports. Repeatedly I worked VK2NRB Bob and VK2TTP
Peter using just 100 watts and a wire dipole at 30 ft. each morning,
and also Europe is starting along with some Asia contacts. New
Zealand has been strong along with V21N in Antigua."

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numbers used in this bulletin, see An archive of past
propagation bulletins is at Find more good
information and tutorials on propagation at

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overseas locations are at

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Sunspot numbers for November 16 through 22 were 126, 122, 137, 149,
101, 101, and 132, with a mean of 124. 10.7 cm flux was 142.3,
147.7, 144.4, 139.6, 139.9, 141.1, and 142.4, with a mean of 142.5.
Estimated planetary A indices were 2, 3, 2, 1, 2, 5, and 6, with a
mean of 3. Estimated mid-latitude A indices were 3, 2, 1, 1, 2, 5,
and 7 with a mean of 3.