Hi Jose, yes quite possibly. You are about 100kms North of Brian, I dont
know how that would affect the path length, but the "interference fringes"
at ground level from multi-hop ionospheric path can differ by an appreciable
about in just 10 kms or so, particularly at a distance of 3700kms. There is
a bit of naive schoolboy maths on my web site with the equations for one and
two hop path lengths. (though for this path length it is probably 2 and 3
hop ) You may also be taking returns from different volumes of ionosphere.
It would seem that things were moving around quite rapidly maybe as a result
of some of the recent minor geomag activity....ripples in the layers ??
Cheers de Alan G3NYK
PS... Brian your email address is being rejected ...your ISP is off air
again or something. (2330 - 2400 19th)
----- Original Message -----
From: "José Manuel" <[email protected]>
To: <[email protected]>
Sent: 19 January 2004 22:44
Subject: LF: Re: Re: RU6LA acty
Hi Alan, Ed and all:
I think that the Machta-Porto and Machta-La Coruña paths are very similar
(about 3700 km), but this weekend I realized that the peaks and the deeps
of
the signals at this end of the hop didn´t coincide at the same time. Can
be
this considered logic?
73 de José, EA1PX
----- Original Message -----
From: "Alan Melia" <[email protected]>
To: <[email protected]>
Sent: Monday, January 19, 2004 4:32 PM
Subject: LF: Re: RU6LA acty
>
> ----- Original Message -----
> From: "Ed Lesnichy" <[email protected]>
> To: <[email protected]>
> Sent: 19 January 2004 11:45
> Subject: LF: RU6LA acty
>
>
> > Dear LF-enthusiasts!
> > Some conclusions from last acty: the propagation was very unstable on
> > a distance up to 3000km at the night but for me there was by a
surprise
> > a very good and stable propagation to daytime (Jan 18)
>
> Hi Ed, I guess I was a bit too optimistic. The geomagnetic condition
> continued to be unsettled (Kp=4) and precipitate electrons into the
D-layer.
> The result was to "top-up" a "reflecting" daytime layer at about 50kms,
> giving enhanced daytime propagation, but at night, persistant ionisation
> gave absorption, limiting levels but with fairly short period deep
fading.
I
> have a plot from Brian from the 17th that displays this. The daytime
> enhancement between DCF39 and CT1 was 10dB higher than average at 1200z.
> Brian's daytime signal from DCF39 is by skywave and on average is some
20dB
> above the groundwave signal at about mid-day. It normally needs a major
> geomag storm in the summer to give enhancement of of 10dB on top of this
in
> daytime.
>
> Thanks for your efforts
> Regards de Alan G3NYK
> [email protected]
>
>
>
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