Arie,

When a decaying satellite or meteorite reenters the atmosphere, there
is a fairly long column of ionized gas following its path.  That
column could easily be hundreds of miles long.

A potential difference along that path would naturally produce a current
with concomitant magnetic effects detectable at distances larger 
than likely if one considers the 1/r^3 factor based on the distance
to the entering object itself.

warren

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