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RE: (meteorobs) Fireball Observed in Spanish Skies



You are correct in your assumptions, except that 5 seconds per mile is more 
accurate. That is why when you observe a fireball you should indeed listen 
for several minutes to see if sound waves can be heard. Assuming a terminal 
height of 10-30 miles (50-150 seconds) for a bolide directly above you, and 
for one close to the horizon it could be 100 miles away (another 500 
seconds) it could be over 10 minutes before the sound wave would be heard.

Wayne

----------
From: 	bruce_musson@dofascodot ca[SMTP:bruce_musson@dofascodot ca]
Sent: 	Wednesday, January 05, 2000 10:19 AM
To: 	meteorobs@jovian.com
Subject: 	RE: (meteorobs) Fireball Observed in Spanish Skies

I generally give 6 seconds per mile for the sound of lightening (its
thunder) to reach me.
When observing a fireball, would it be feasible to stand quietly for 3 or 4
minutes or more to listen for sound from something that could be a great
number of miles away.
In fact for every 10 miles, that would be about 1 minute.
Does anyone know the greatest distance from a fireball, or meteor, that
'acoustic' sound has been heard ?

Bruce
Computer Hardware Analyst - IS/Field Services
* email:	bruce_musson@dofascodot ca
* tel: 		(905)548-7200 x2388
*  fax:		(905)548-4960



> -----Original Message-----
> From:	Nahum Mendez Chazarra [SMTP:nahum@arrakis.es]
> Sent:	Tuesday, January 04, 2000 3:33 PM
> To:	Meteorobs; Meteorite-List
> Subject:	(meteorobs) Fireball Observed in Spanish Skies
>
> Hello to everybody and Happy New Year,
>
> 	Today (4-01-2000), I observed a white-green fireball with
> aproximately -9
> magnitude while it was crossing Cetus at 19:32 UT. I not heard any sound
> from it, but appeared to me that it was very near from me. The 
observation
> was maked in Rojales (Alicante, Spain) at 38o.083N and 0o.717W. I 
observed
> it about 14 seconds but it last more but I was walking when I saw it and 
I
> not did a exact timing.
>
>
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