DXing : About the Grey-Line Propagation -aka- "Terminator"
Day-to-Night [Solar] Global Image Maps
http://en.wikipedia.org/wiki/Terminator_(solar)
http://sos.noaa.gov/datasets/Land/day_night.html
http://www.knls.org/English/trascrip...1.htm#Grayline

On Wed, 14 Jan 2009 21:45:48 -0800 (PST), RHF
wrote:

DXing : About the Grey-Line Propagation -aka- "Terminator"
Day-to-Night [Solar] Global Image Maps
http://en.wikipedia.org/wiki/Terminator_(solar)
http://sos.noaa.gov/datasets/Land/day_night.html
http://www.knls.org/English/trascrip...1.htm#Grayline
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* The Twilight Zone . . . Revisited
-by-Steve Nichols [G0KYA]
http://sharon.esrac.ele.tue.nl/mirro...erevisited.pdf
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* Ionosphere Properties and Behaviors - Part 9
-by- Marcel H. De Canck [ON5AU]
http://www.antennex.com/prop/prop0207/prop0207.pdf
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* The Radio Propagation - Working with the Gray line (V)
http://www.astrosurf.com/luxorion/qsl-propa5.htm
-source- LUXORION -by- Thierry Lombry [ON4SKY]
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* The Myths of Low Band DXing -by- Gerry [VE6LB]
http://www.telusplanet.net/public/telwest/LBDX.html
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* Current Gray-Line Position on Earth {Map}
http://www.worldtime.com/cgi-bin/wt.cgi
http://www.ng3k.com/Misc/n4kgprop.html
http://www.spacew.com/www/160gray.html
http://www.iri.tudelft.nl/~geurink/grayline.htm
http://www.smeter.net/propagation/vi...-gray-line.php
.
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and now you know -cause- you just read it ~ RHF {pomkia}
[ yes - you too can hear it on the ray-di-oh ~ RHF ]
Twain Harte, CA -USA-
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Shortwave Listener QSL Reports Newsgroup : SWL : INFO
http://groups.google.com/group/short...r-qsl-reports/
.
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Are You Interested in building a better Shortwave Listening
(SWL) Antenna ? {SWL Group} = http://tinyurl.com/ogvcf
GoTo = http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
RHF's Standard "Shortwave Radio Listener (SWL) Antennas Group"
Reference Message Signature-Line = http://tinyurl.com/25zbrg
http://groups.google.com/group/rec.r...1dac3b4a1798e0
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* Remember 55.5% of Shortwave Radio Listening (SWL)
is the Shortwave Antenna = http://tinyurl.com/ogvcf
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RHF's Radio Shack in Twain Harte, California -USA-
SHACK INFO = http://tinyurl.com/2skmxm
Shortwave Radio / Receiver and SWL Antenna Info
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-= 6GZ4GB + 32UCPM + OGVCF + 25ZBRG + 2SKMXM =-
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On Dec 31 2008, 4:15*pm, RHF wrote:
"Junk Box" Shortwave Radio Listener (SWL) 9:1 Matching Transformer

GRAYLINE PROPAGATION
The Grayline is a band around the Earth that seperates Daylight from
Darkness. It is a somewhat fuzzy area because the Earth's atmosphere
tend's to defuse light into darkness. On one side of the Earth the
Grayline is coming into light [Dawn] and on the other side of the
planet it is going into darkness [Dusk]. Propagation along the
Grayline is very efficient. The Grayline runs North and South but
varies as much as 23 degree's either side of the North South line. The
variation is caused by the Earth's axis relative to the Sun. The major
reason for excellent Grayline Propagation is because the D-Layer
disappears quickly on the sunset side of the Grayline and hasn't built
up yet on the Sunrise side. You have about one hour for best
conditions, that's about 15 degree's. Beams and high power work best,
but an omni directional antenna also works.

http://www.ae4rv.com/tn/propflash.htm
A Flash movie describing the basics of HF (short-wave) radio
propagation across the globe. With text and animation. Courtesy of
AE4RV