IIRC it's a very high DC component with irregular spikes that contribute to very wide
spectrum upto few
MHz minimum.
Also lightning is a high power surge. I said power including current and voltage both.
Estimated values
are 1.2MV @50KA. It jumps like waterfall. It hits a layer of atmosphere as if it's a
rock, induces very
high ionisation at that altitude, shifts it's direction abruptly and makes another
jump.
I don't know where did meteorological department of India dig these figures and
explanation but I would
liek to believe them.
BTW telefone line are supposed to have a BW of 4KHz while experiments(I did
that...:-)) tell that
300-500Hz are enough to transmit a conversation.
I am really late for this hot discussion...
Shridhar
"[EMAIL PROTECTED]" wrote:
> Indraneel Majumdar spewed into the ether:
>
> >Is the lightning high frequency, or just plain DC? The telephone line
> Lightning is just a spark. Does the concept of AC and DC apply to a spark? If it
>does, I guess its DC.
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