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/
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