Arie,
>> warren wrote:-
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.

    I seem to remember the transient effects of meteors on the earth's 
magnetic field being described in Amateur Radio Mags. (RadCom). The wind 
blown ionised path left by the meteor interacts with the earth's magnetic 
field generating a current and the conducting track also reflects radio 
waves. For that part of the path above about 50 Km, it is unlikely that any 
shockwave would have been heard on the ground. The most likely area to 
experience a sonic boom would be near the end of the trajectory, which is 
reported to be over the sea. Is a SSW/NNE track possible for a meteorite 
anyway, bearing in mind that cosmic debris is likely to be moving roughly in 
the plane of the earth's orbit and would therefore have had to come in over 
the South Pole?

    Did the Infrasound Station at Warramunga get anything?  See 
http://rses.anu.edu.au/seismology/

    Regards Chris Chapman

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