Re: [Propagation] ionosonde

["David J. Ring, Jr." <n1ea@arrl.net>]

Since most of the world's longrange telecommunications is via satellite, 
there is little money invested in HF research as their is little perceived 
need for it.

73

David N1EA
----- Original Message ----- 
From: "Pnu7t" <nu7t@gbis.com>
To: <propagation@contesting.com>
Sent: Friday, January 07, 2005 10:27 AM
Subject: [Propagation] ionosonde


> Fellow Aeronomists,
>   Somewhere I read ,
> "Unfortunately, vertical reflections typically disappear at frequencies
> higher than
> the ~30m range so that the more popular HF DX bands (10m-20m) cannot be
> adequately characterized by these vertical ionograms. For these higher
> frequen-
> cies, oblique ionograms are generally utilized to yield empiric data on 
> the
> refractive properties of the ionosphere and the virtual altitudes of these
> reflections. However, such data are generally limited since the goal of 
> most
> ionospheric research studies are aimed at determining the variation of
> electron
> density with height."
>     This may have appeared on the ips.Australia web site.  Is this true ??
> If this is true, a nearly impossible situation exists to provide reliable
> data.
> Steve, nu7t
>
>
>
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