[meteorite-list] Burst of Meteors Seen Near Finland / Correction to directions...
From: Pekka Savolainen <pekka.savolainen_at_meteoritecentral.com>
Date: Wed Jul 14 16:40:27 2004
Please, ignore my former e-mail, made some mistakes with
directions...:-( These should be more correct.
Hello, Bjorn and the list,
the direction was (or at the moment we suppose, it was) about from
west / north-west to east / east-south, against Vaasa, Finland. The
angle seems to was quite low, about 30 degrees, and the crossing-
point with the ground is somewhere between Vaasa and Valassaaret
on the finnish coast. So it may be possible, something has reached
the shore of Finland between Vaasa and Valassaaret.
We don?t have a map yet, but you can at least locate Vaasa from;
Bj?rn S?rheim wrote:
>Actually my impression is that the corkscrewing is
>caused by the *very* high speed of a meteor, not the rotation
>of the meteorite, if there is rotation at all.
>Think about the corckscrewing you see at the wingtips
>of a jetplane - airliner. The higher the speed the more
>Anyway, which direction did this object travel? If it was seen
>from both Sweden and Finland it might have reached the shore
>in either countries..
>>===== Original Message From m.fries_at_gl.ciw.edu =====
>> Impressive picture! The trail is twisted in a repeating fashion that
>>can't just be due to winds - I'd say the meteor corkscrewed its way
>>through the atmosphere. I'm curious - the maximum "survivable" entry
>>velocity for meteorites was calculated a while back (forgive the lack
>>of reference here). Would a twisting, spiraling entry have an impact
>>on the survivability of meteorites? I'm inclined to believe that if
>>the total air resistance vector was divided into an opposing vector and
>>a sideways vector... would that mean the meteorite could be smaller
>>and survive, or would it have to be larger?? On one hand, the vector
>>magnitude parallel/opposite to the flight path would be smaller, but on
>>the other hand you'd have a "sideways" vector that would put a shear
>>force on the meteorite. The shear strength of materials tends to be a
>>fraction of that of the bulk material strength, so would the meteorite
>>be MORE likely to break up in a corkscrewing flight path?
>> Thoughts? Comments? Does anyone know if anyone has calculated this
>>sort of thing before?
>>>You can find the pic from;
>>>text only in swedish...;-
>>Marc D. Fries, Ph.D.
>>Postdoctoral Research Associate
>>Carnegie Institution of Washington
>>5251 Broad Branch Rd. NW
>>Washington, DC 20015
>>PH: 202 478 7970
>>FAX: 202 478 8901
>>Meteorite-list mailing list
>Meteorite-list mailing list
-- Pekka Savolainen Jokiharjuntie 4 FIN-71330 Rasala FINLAND + 358 400 818 912 Group Home Page: http://www.smartgroups.com/groups/eurocoin Group Email Address: eurocoin_at_smartgroups.comReceived on Wed 14 Jul 2004 04:45:50 PM PDT