You can also get really really LOW radio frequencies out of HAARP, again by using indirection. The array can't do it directly.
Ok. If you take a flow of electrons, and cause it to vary either in intensity or direction, either of current flow, or physically, in a cyclic fashion
related to the frequency of radio wave you want to make, you will get production of radio waves. It's more likely you'll see a radio wave produced by
varying the amplitude of a current at the frequency of radio wave you want to make. I'm grossly oversimplifying here, so forgive me when you find that
you can't match this explanation up really well to other stuff on the net.
Your local AM radio tower works this way.
A method you DON'T usually see, is that you can also do this by just physically shaking an electron flow up and down. This doesn't work properly in
wires, because there's no really coherent electron flow in a wire - that's another discussion. But if you have a beam of electrons, all pretty much
going in one direction at about the same speed, you can shake them up and down and you'll emit a radio wave that's related to the electron speed and
shake rate, with an amplitude related to the current. That's used a lot in a type of laser called a FEL. If you like, you might be able to find a nice
description of a FEL with pictures and get a better idea of what I'm trying to describe.
Now, hold that concept in your head, while we jump to something else.
For reasons beyond the scope of this explanation, there is a strong, fast stream of free electrons that flow in a circle around the polar areas called
the auroral electrojet. It is composed of electrons mostly moving in one direction at about the same speed. That meets the conditions for generating
radio waves, if you could either shake it or vary its amplitude! The energy in the electrojet flow is dependent mostly on the Sun and the magnetic
field of the Earth, so the electrojet varies in amplitude and moves around physically depending on space conditions. There are electrojets at both
poles and at the equator. The polar ones are the ones you want to work with for ground work like HAARP. We have had research stations at the South
Pole too, mostly at Siple Station which has long since closed up shop. The auroral electrojet is why HAARP wasn't situated in Schenectady - in order
to diddle it you want to be right under where it normally runs.
So, we have our highly energetic stream of electrons, fairly coherent, solar powered. How do we fiddle with the amplitude or direction? Well, recall
that HAARP is an ionospheric heater by intent. If you heat a gas that's not contained, the pressure will stay the same but the density will decrease -
the hotter ionospheric gases, as thin as they are, still follow the ideal gas law. When HAARP heats them a bit, they thin out. The electrical
resistivity of the gas increases as it thins out. So, hotter ionosphere, higher resistance, less current. No heating, cooler ionosphere, more current.
In that mode, the array "paints" a pattern of higher power - less power - no power - less power - higher power - less power - no power in a broad
brush over the electrojet flow. This doesn't cause a LOT of change in the jet, because it's huge. But it does have some effect - the electrojet itself
will, by the laws of physics, radiate a low frequency RF signal whose wavelength is related to the electrojet electron velocity and the size of the
pattern painted, because you're changing the current a tiny tiny percentage. That gets you a few Watts of ELF output, maybe 6-8. It's not much at all.
Horribly inefficient, seeing that you're belting out about 1.8 million Watts to get 8 W of ELF, but generating ELF is heinously inefficient anyway.
That's one way.
Another is to make the jet wiggle up and down instead of getting thicker and thinner. In that mode, the array paints something like pinball bumpers in
a sinusoidal pattern, forcing the electrojet to flow up and down a bit, in a cyclical fashion. The size of the pattern and the flow speed of the jet
again set the frequency that's emitted, and in that mode you can get about 35W of ELF, but not usually, it's more like 20 in most cases.
At one time, ELF transmission was important because the US used to use it to communicate with subs. We had two ground based transmitters, but they're
very vulnerable to attack. So we don't use that anymore. At the time, this side function of HAARP was considered important, but now it's another
edit on 2-11-2012 by Bedlam because: (no reason given)