Message-ID: <001001c4f370$9d02a720$6507a8c0@Main>
From: "Alan Melia" <Alan.Melia@btinternet.com>
To: rsgb_lf_group@blacksheep.org
References: <009701c4f319$3a34fe60$fe79a8c0@PCVONWALTER> <001301c4f358$a60eb5b0$6501a8c0@eagles>
Date: Wed, 5 Jan 2005 21:50:42 -0000
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Subject: LF: Re: DI2AG 440KHz...rapid fading
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Hi J, I am not sure I understand what you say. You are in a special position
and I am much further south in Magnetic latitude, I rarely see aurora here.
My calculations suggest that the time delay between ground wave and one hop
skywave is 20 to 60usecs and I dont think you hear that??. It is possible
you get a "whispering gallery" effect in the auroral circle which might
account for what I presume are 100s of milliseconds delay.?? That would
certainly be an interesting effect.

Cheers de Alan G3NYK

----- Original Message -----
From: "J. Allen" <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: 05 January 2005 18:58
Subject: LF: DI2AG 440KHz...rapid fading


> Alan, Walter, and All,
>
> I have often visually observed the phenomena of intense Aurora waving and
> fluttering that would be in the range from rapid flutter to once every few
> minutes.  Aurora (both visible and invisible) also occur after geomagnetic
> storms, and can be many hundreds of kilometers long.
>
> I observed a visible sinewave echo on VE7TIL's signal when he had QSB
> recently... His telltale sine wave signal was perfect for watching the
> effects of QSB.   There was the direct wave clear as a bell and an echo
> which arrived long enough later that you could tell it was another
incidence
> of the same signal but significantly out of phase.  Consider borrowing
> Scott's signal format for a short period during your testing.  It is
> excellent for our experimental work.
>
> It might also be good to check this site whenever the fading occurs, to
see
> where the Auroral activity is relative to your area.  There may be a
> correlation.
>
> http://sec.noaa.gov/pmap/pmapN.html
>
> 73,
>
> J.
> VY1JA
> CP20kw
>
>
>