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Subject: Re: LF: VLF propagation (continued..)
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Paul Nicholson wrote:

>                I'd like to see a plot of signal strength
> against distance for 70km ionosphere and see how it compares
> with the simple model in
>
>  http://abelian.org/vlf/9k
>
> Too bad we are stuck with their silly polynomial fit for
> attenuation.


Hello Paul,  LF Group

Sure,  i will  do it pretty soon. ( with  h = 70 km)
as for the attenuation  values... indeed, 12th degree fit.. have seen 
SUCH for the  first time..
i am  still in the course of  finding  the values  of alpha  for  the  
specified freq.
for  Stefan's  8.97 kHz it is around 2 and even slighty greater ( the 
paper by Barr, Jones, Rodgers
"elf and  vlf radio waves')  while the fit  yields 1.86  (and used  in 
my calc)
will do further work on it...
                                                         yours, Piotr, 
sq7mpj
qth: Lodz /jo91rs/