Lightning...

• To: tesla-at-poodle.pupman-dot-com
• Subject: Lightning...
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 05 May 1997 23:23:12 -0500
• Approved: tesla-at-stic-dot-net

Subject:  Lightning...
  Date:   Mon, 5 May 97 10:08:58 EDT
 From:   pierson-at-ggone.ENET.dec-dot-com
    To: tesla-at-pupman-dot-com
        
    CC:  pierson-at-ggone.ENET.dec-dot-com


" A lightning stroke has a fast rise time, it is a RF voltage."

>        No way!  Primarily unipolar with a rise time of a few
>microseconds and a fall time of tens to hundreds.
        Which means it is an RF voltage.  Fourier Transfrom.  Full
        transform is complicated.  Roughly, tho, RF components
        Will be present a '1/the_risteime'.  IN other words,
        '1/2or3 microseconds' == 200-300 Khz.  Coiling Freqs, last
        i looked.

        Lightning, in the stroke is not particularly unipolar, as the
        surge can travel back and forth several times, in the ionized
        column, during the stroke.  It IS conveneient to model it
        mathematically as, say a '2 by 50' impulse (2 Us rise, 50
        uS fall), but that is a mathematical fiction, invented about
        1930, to suit the math abilities avilable then, and to some
        extent, created to model the effects of lightning on other
        conductors (eg power lines,  phone lines).  For references,
        AIEE Tranasactions from 1910ish on....

        regards
        dwp

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