# RE: TC vs Lightning

```See terrestrial lightning and 'upward lightning' parameters online at
http://www.altair-dot-org/atmoelec.htm
Much of the terrestrial data is from Uman.

Will
<snips>

>   I have attempted to compare the Lightning parameters in Uman's book with
> a typical Tesla coil using the JHCTES program. The coil is 60 KW with a 10
> meter (32.8 ft) spark length. This coil is similar to your 55 KW coil
> described in the TCBA News Vol 10, #2, page 14.
>
>                     Uman                Typical
>                     Lightning           Tesla Coil
>
>   Kvolts/m          1000                316
>   Surge Z/m         100                 2434
>   Amps              10^4                130
>   watts/m           10^10               4.1 x 10^7
>   time usec         10                  10
>   joules/m          10^5                410
>
>   KVs = 65 x (32.8 X 12)^.65 = 3160/10 = 316 KV/m
>   Surge Z ohms = sqrt(ls/Cs) = sqrt(.0646/109X10^-12)
>                = 24344/10 = 2434.4/m
>   Amps = V/Z = 316 000/2434.4 = 130
>   Watts = V x A = 316000 x 130 = 4.1 x 10^7/m
>   Joules = W x t = 4.1 x 10^7 x 10^-5 = 4.1 x !0^3/10 = 410/m
>
>
> >See Page 215, 'Lightning', by Uman.
> >The typical energy in a strike is approximately 100kJ/m.
> >Therefore a 2 mile strike would therefore dissipate about
> >_322 MILLION_ Joules.
> >
>

```