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Date: Fri, 26 Mar 2010 00:36:02 +0100
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Subject: Re: LF: Ionospheric VLF propagation
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Paul Nicholson wrote:

> .....
> I found in another paper a formula for field strength at VLF.
> It uses Legendre functions to model propagation in terms of
> cavity modes, combined with an empirical model of attenuation.
> Formula is too long to post here but the paper is at
>
> http://dspace.mit.edu/bitstream/handle/1721.1/16973/53712465.pdf?sequence=1 
>
>
> Maybe I will program this if I get time, but a formula you
> can run on a calculator is much nicer.
>
Dear  Paul, LF group
 thank you for the  above reference . I will also try to program these 
formulae
Easter is coming ... so maybe i will have more time  to  do it. i 
already have
some fortran routines dealing with special functions ( i use it from 
time to time)

During  my search  upon the VLF propagation issues i have found
another papers of J.R. Wait which could be  useful . these are:

J.R. Wait, "On the theory of propagation of  electromagnetic waves along 
a curved surface"
Can. J. Phys.  1958, Vol.36 ,No 1, pages 9-17
{i have  an access to Canadian Journal of Physics at my  university 
library but , unfortunately ,
not  to the 50's )

J.R. Wait: "Two-dimensional treatment of mode theory of the propagation 
of v.l.f. radio waves"
J. Research NBS, 1964, Vol.68D, pages: 81-94
J.R. Wait: "On the theory of mixed-path ground-wave propagation  on a 
spherical earth"
J. Research NBS,1961, Vol.65D,No 4, pp.401-410
again, i do not have access to this Journal of Research of National 
Bureau of Standards

as these findings are quite new i had no time to make, say, more 
"aggressive" search  i.e.
using my univ. library  and ask  the library stuff  there to continue 
with the search through
 the library 'network'  . Of course, as  I will  be successful with 
these articles ( i.e. having them at hand)
will issue you a notice.

> Well I think we've squeezed everything possible out of page one!
>
Yes, I agree!

> Here is a nice little essay to read on a tea break,
>
>  http://web.mit.edu/sts/pubs/pdfs/MIT_STS_WorkingPaper_37_Yeang.pdf
>
> It describes a bygone era in which radio amateurs played a
> significant role in scientific research into radio propagation.
>
 
I certainly will  read it,   :)

                                                              Yours, 
Piotr,  sq7mpj
qth:  Lodz /jo91rs/