Hello Pekka,
Thanks for the info.
I found a nice link to Valassaaret here:
http://www8.calle.com/info.cgi?lat=63.4333long=21.0667name=Valassaaretcty=Finlandalt=3
(Paste the two parts into one with no space between)
Umeå in Sweden is the big yellow spot on the left side, while
Vaasa is the biggest yellow spot on the right shore, by the
small bay.
By the way, a more updated thery of corckscrewing follows here:
The supersonic speed of the meteor - several km/s upto ~72 km/s -
will create a cavity - a near vacuum - in the wake of its
flightpath, inside its shockfront.
Very shortly (~momentarily), the air will rush in to fill the
cavity from all sides, like what is happening in a tornado e.g.,
or in a kitchen sink as the water flows out. This will create
a spiraling motion of the fluid, water or air in these example
cases.
(Is the turning direction determined by the particular location
in one the two hemispheres of the Earth in the meteor case,
by the way??)
The smoke coming out of the melting meteor is subsequently
seized by the spiraling motion of the inward rushing air,
thus voila - a corckscrewing meteor is created.
Is this accepted or not by current knowledge?
Bjørn Sørheim
= Original Message From Pekka Savolainen [EMAIL PROTECTED] =
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;
http://worldatlas.com/webimage/countrys/europe/lgcolor/ficolor.htm
best,
pekka s
Bjørn Sørheim wrote:
Hello,
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
corckscrewing effects.
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..
Bjørn Sørheim
= Original Message From [EMAIL PROTECTED] =
Howdy, list
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?
Cheers,
MDF
You can find the pic from;
http://www.vasabladet.fi/nyheter.asp?katID=1
text only in swedish...;-
best,
pekka s
--
Marc D. Fries, Ph.D.
Postdoctoral Research Associate
Carnegie Institution of Washington
Geophysical Laboratory
5251 Broad Branch Rd. NW
Washington, DC 20015
PH: 202 478 7970
FAX: 202 478 8901
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