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Article #1325Re: Lightning
From: Carl Witthoft
Date: Wed, 22 Jul 1992 12:10
Date: Wed, 22 Jul 1992 12:10
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In article <1085@kepler1.rentec.com> andrew@rentec.com (Andrew Mullhaupt) writes: >You hear lightning on AM radio so it isn't just DC, right? It's pretty broad >band, since you can get it all over the spectrum. So it's perhaps true that >initially the spark crosses the gap in some directional sense, there's a lot >of AC in a lightning strike. x I guess a redirect to the subject "Fourier Analysis" would be a good idea here. :=) Any short pulse or collection of short pulses have frequency content all over the spectrum (so to speak). Any radio receiver has finite out-of-band frequency rejection. And, of course, any finite event can't be pure DC. -- Bobby Newmark, aka Carl Witthoft @ Adaptive Optics Associates aoa!carl@bbn.com carl@aoa.utc.com 54 CambridgePark Drive, Cambridge,MA 02140 617-864-0201 **Just say NO to HMOs**
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Newsgroups: sci.physics Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!gumby!yale!actcnews!aoa!carl From: carl@aoa.aoa.utc.com (Carl Witthoft) Subject: Re: Lightning Message-ID: <1992Jul22.121020.11816@aoa.aoa.utc.com> Organization: Adaptive Optics Associates References: <1241@newsserver.cs.uwindsor.ca> <1992Jul18.082030.6453@cco.caltech.edu> <1085@kepler1.rentec.com> Date: Wed, 22 Jul 1992 12:10:20 GMT Lines: 19