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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It is not difficult to imagine a ribbon of excited ionized conductive gas 1 million kilometres long somewhere in our galaxy, nor is it difficult to imagine that such a conductive ribbon could be excited into resonance by, for example, the rotating magnetic field around black holes etc.
If it were, by way of illustration, 1 million km long then it's resonant frequency as a quarter wavelength antennar would be 7.5 -15 Hz..
It's radiation efficiency need not be high if it it is being energized by power sources of cosmic scale.
Let us suppose that such sub-ULF waves are generated on the galactic scale:
How could such slow cycling ever be detected? Would it ever be possible for us to detect them?
... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
I can't imagine much would be radiated. Granted, if it's tapping into a trillion billion gigwatts of power generated by a rotating neutron star or something, you can afford to waste a lot and still get out, but that presents other problems. A half-wave dipole has a free space impedance of something like 73 ohms. I'd think that 1 million km of ionized gas would have to have a resistance a million times higher at the very least (maybe a billion, or even a trillion). So, if most of the exciting energy ends up as heat in the gas, it's more productive to look for the radiated heat, even if it is way down in far infrared. That way, we might even be able to see the structure and shape of the ribbon, rather than just detect its presence.
The other problem to consider is the Q of such a radiator, not just efficiency. If the Q is very low, the power will be spread around quite a wide bandwidth, and will be much more difficult to dig out of the noise.
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Galactic sub-ULF hypothesis
