FW: [PBARC] FW: ARLP029 Propagation de K7RA

Tue Jul 20 10:48:24 EDT 2004

Thanks,

Glenn

-----Original Message-----
From: pbarc-bounces at mailman.qth.net [mailto:pbarc-bounces at mailman.qth.net]
On Behalf Of E. Glenn Wolf, Jr.
Sent: Tuesday, July 20, 2004 08:47
To: pbarc at mailman.qth.net
Subject: [PBARC] FW: ARLP029 Propagation de K7RA

Thanks,

Glenn

-----Original Message-----
From: ARRL Web site [mailto:memberlist at www.arrl.org]
Sent: Thursday, July 15, 2004 13:03
To: egwolfjr at classicnet.net
Cc: Subscribed ARRL Members:
Subject: ARLP029 Propagation de K7RA

SB PROP @ ARL $ARLP029
ARLP029 Propagation de K7RA

ZCZC AP29
QST de W1AW
Propagation Forecast Bulletin 29  ARLP029
>From Tad Cook, K7RA
Seattle, WA  July 15, 2004
To all radio amateurs 

SB PROP ARL ARLP029
ARLP029 Propagation de K7RA

We're putting out this bulletin a day early this week.  K7RA will be out of
town, and Carl Luetzelschwab, K9LA, who often writes the bulletin in K7RA's
absence, is giving a talk on 160-Meter propagation over the weekend at the
Pacific Northwest DX Convention, near Seattle.  See http://www.wwdxc.org and
specifically http://www.wwdxc.org/convention/2004conv.htm for information.

Carl wrote a great piece for the propagation section of the ARRL Technical
Information Service site, which is reached via the URL at the end of this
bulletin.  Titled "Propagation Planning for DXpeditions," it is good reading
for anyone interested in the practical applications of HF propagation.  The
direct link to his article is,
http://www.arrl.org/tis/info/pdf/propplan.pdf.  You will need Adobe Reader
to view the article.

Sunspot numbers and solar flux rose this week.  Average daily sunspot
numbers were up 54 points above last week's average.
Sunspot 649, a big one, came around the sun's eastern limb this week.
Helioseismic holography shows more sunspots on the far side of the sun, so
the short-term trend for solar activity is up.

Big news is a huge X-class solar flare that was detected at 0140z on July
15.  If a coronal mass ejection is heading toward earth, it could mean big
geomagnetic storms.  Currently the prediction made before the flare was for
planetary A index of 12, 20, 12 and 10 for Thursday through Sunday, July
15-18.  Predicted solar flux for the same period is 140, 140, 135 and 135.

Several readers sent in articles this week about solar storms last October
and how the effects are still being felt at the edge of our solar system.
The Washington Post ran an article about it last week, which you can read on
the web at,
http://www.washingtonpost.com/ac2/wp-dyn/A37614-2004Jul8?language=printe
r.

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 July 8 through 14 were 17, 32, 58, 98, 118, 129 and 149
with a mean of 85.9.  10.7 cm flux was 81.8, 86.7, 93.3, 104.4, 125, 149.5
and 138.1, with a mean of 111.3.  Estimated planetary A indices were 5, 5,
8, 14, 13, 16 and 9, with a mean of 10.  Estimated mid-latitude A indices
were 1, 4, 5, 13, 12, 11 and 6, with a mean of 7.4.
NNNN
/EX

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