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Ady,
The propagation mode was skewed F2 via horizontal gradients in the ion
concentration. The signal path and heading was SW across western Africa,
then west through the southern Caribbean Sea region just north of the
Geomagnetic Equator, then NW across the U.S. The F2 MUF along that path was
high enough to propagate the signal. Some Chordal Hop type signal ducting
was probably also involved.
73,
Thomas F. Giella, KN4LF
Lakeland, FL, USA
kn4lf@arrl.net
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----- Original Message -----
From: "Ady YO2NAA" <yo2naa@gmail.com>
To: <propagation@contesting.com>
Sent: Monday, March 24, 2008 6:58 AM
Subject: [Propagation] Strange 14 MHz propagation from YO to W7
> This e-mail posting is from the Radio Propagation Reflector that you're
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>
> Hi all,
>
> I'd like to mention a strange propagation I've experimented on 17 Feb 2008
> around 21.40 UTC on 14 MHz band, when I've worked K7RL and W7WA using 150W
> and a dipole.
> These W7 stations was the only stations I can hear on 14 Mhz band at that
> time. Usually 14 MHz is completely closed after 19 UTC at my QTH (KN05OS).
> I'm curious what kind of propagation mechanism can explain these QSOs.
> I suppose it was ES who brings my signal somewhere in Norway, but from
> there
> the path is entering the auroral zone, where maybe it was a kind of
> auroral
> ES hops. The F2 MUF along the first 70% of the path has to be under 10
> MHz.
> I've checked some ionosondes, the one from Belgium indicate some ES and an
> F2 MUF of 10 MHz, see
> http://digisonde.oma.be/IonoGIF/DB049_2008048214505.GIF . On 17 Feb Solar
> flux was 71 and K was 3.
> If anyone can explain what was the propagation mechanism in this case,
> I'll
> be very glad to know. Also any info about similar QSOs will be highly
> appreciated. Maybe it's common for Scandinavia to work W7 this way, and I
> was bring in the game by the occasional ES.
>
> Many thanks,
>
> 73 Ady YO2NAA
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