Magneto-tellurics
On Mon, 12 Nov 2001, Greg Broiles wrote:
> At 07:50 AM 11/12/2001 -0800, Major Variola (ret) wrote:
> >But you missed the mil 4-engine cargo-type plane towing a wire held
> >in a trailing Y config by two mil copters flying in tight formation
> >behind it,
> >circling SF. Yes, I wouldn't have believed that was possible without
> >having seen it.
> >
> >Maybe they were mapping too.
>
> They overflew San Jose and Santa Clara, too, headed westbound.
>
> What would a trailing wire like that measure or receive? My limited
> understanding of RF says it'd be good for picking up very low frequency
> emissions or transmissions - but I don't know of any sources of those that
> I'd expect to be of interest, other than those used by US subs and I'm sure
> they have better ways to pick those up.
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