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Registered Member #1905
Joined: Sat Jan 03 2009, 08:35AM
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Posts: 8
Having read a few posts on EMP pulses It got my tiny mind wondering why an EMP pulse could harm electronics when lightning does not have the same effect (unless actually striking or very close)!amazed
because emp's are created with currents in the range of millions of amps, where lightning strikes are only about 50KA. I know explosively pumped flux compression generators create a very strong pulse, but im not too sure how they work
Account deactivated by user request on 6/11/2009. Registered Member #1071
Joined: Fri Oct 19 2007, 02:13AM
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A flux compression generator needs to drive something to generate RF at a high power, or else it would only effect things that were very close also. Flux compression generators can put out hundreds of megaamps of current, but only into a very low impedance load. That is why they usually use them to drive a vircator, because a relativistic magnetron looks like an open and it wouldnt be able to drive it. These are HPM devices that make narrow band microwaves that can be directed and shot at something to destroy it, but it still needs to be pretty close, maybe hundreds of meters or km depending on the antenna, but not huge areas like a nuclear weapon detonated in the ionosphere.
Lightning strikes are huge arcs, but they are not like HPM devices that are designed to efficiently create high power RF in the GW power range and be directed. So much of the energy in lightning is wasted on not specifically making RF.
It can launch Waves into the ionosphere that can be heard on the other side of the planet however. Do a google search for Whistler waves.
Registered Member #1911
Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165
Our Finest Hour wrote ...
Thanks, I always imagined lightning to have a higher charge than 50Kva
Lightning has MUCH greater than 50KVA.
Apparently it has around 1MV, but I've seen more credible-looking websites saying that it may be 100MV.
Lightning also, apparently, can have amperage up to 200KA. 200KA at 1MV = 200,000,000,000VA
(Is that 20 Billi-volt-amps?)
Now just imagine if the website I saw was right and it's 100MV! (2 Trilli-volt-amps?)
Now, that website also says that the empire state building gets struck about twenty times per year. That means 20X 2 Trillivoltamps = 40 Trillivoltamps
Anyways, in one strike, which lasts about 0.2 seconds, you'd expend energy equal to (at its lowest?) 20,000,000,000VA * 0.2s = 4,000,000,000J
Wow. From one weak lightning strike, we can get four billion Joules. And to think that lightning strikes the Earth 6,000 times per minute.
Sounds like a nice power supply, doesn't it? If only we could tap into it.. ...Nikola Tesla would have, had he the money and the life-span.
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Whats the difference between lightning and an EMP pulse??
