Aloha to all:
I joined this list yesterday in order to ask a question. My questions have
been answered and I thank all that responded!
Before I leave, I simply must ask about the statement below, that keeps
appearing in this thread:
"The power emitted by these ionospheric heaters is QRO in terms of man-made
radiated power but is only a fraction of the energy which the ionosphere
receives from the Sun."
Reference is being made to Solar energy per cubic whatever. I think if you
look at solar energy at any hf wavelength, you will find the power density
no where near a kW per m^3, only these power levels are realized in the
upper end of the EM Spectrum. Perhaps most strongly, near-IR and up. I
believe this statement is usually used to describe the Sun's total, DC to
Daylight+ power density, in our breathable atmosphere.
Having worked on the HAARP with the Brown and Root boys, the thermopile side
of the construction, I find the above a bit incorrect. After copying their
CW broadcast on HF when they turned it on, and measuring 0.2 milliVolt
signals from it in Idaho, I would say she is quite robust, especially at
NVIS radiation patterns.
Anyone that has watched the HAARP in ops, would Never tell you it does NOT
change the ionosphere. Power density above the facility can approach levels
that the beam pattern through atmospheric gases, well below the clouds can
be seen as "warmer" air through an IR viewer.
The HAARP is a fascinating device. In ops, and modulated at say 22 hz, these
data easily travel the entire globe penetrating the oceans in the southern
polar regions. It's probably the best comms the Navy has ever had. A great
way to listen to this stuff is simply couple your biggest chunk of
wire/ferrite directly into your sound card and run a software like Spectrum
Lab... absolutely fascinating! Weak signal at its finest!
73 to all and thanks for letting me into this way to busy reflector!
Jeremy w7eme
http://www.oregoncoast.com/oaxaca
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of David G4FTC
Sent: Monday, February 07, 2005 9:29 AM
To: amps@contesting.com
Subject: [Amps] 10dB and propagation
>I don't believe there is ANY transmitter on earth (amateur or pro)
>that could influence the ionosphere by causing a non-linear behavior
>in that.
No one seems to have mentioned the Luxembourg Effect. This resulted in
Radio Luxembourg's signal appearing on other nearby signals through
ionospheric cross-modulation.
In the past there have been a number of well publicised experiments using
ionospheric heaters in an attempt to partially control (or more correctly
modify) the characteristics of the ionosphere. Some of these experiments may
still be on-going.
The power emitted by these ionospheric heaters is QRO in terms of man-made
radiated power but is only a fraction of the energy which the ionosphere
receives from the Sun. The key seems to be using the right frequency from
the right location - and most ionospheric heaters seem to exploit the
properties of that part of the ionosphere which contains the polar
electrojet (E layer?), which under the correct conditions, can be apparently
controlled/modified with relatively small amounts of incident energy.
In 1996 the BBC made a "Horizon" programme called "Masters of the
Ionosphere" which outlines the history of man's attempts to control the
properties of the ionosphere, sometimes with quite amazing results. For
anyone interested in some of the more unusual aspects of radio propagation,
this programme is highly recommended. Transcripts of the script are
available for download from a number of Internet sites - a google search on
"Masters of the Ionosphere" will give locations, but the video really is
worthwhile viewing as it contains many graphics which really help to
illustrate the underlying principles involved.
David G4FTC
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|