[meteorite-list] Sutter's Mill/Lotus/? bolide physics at the time of breakup

From: Mendy Ouzillou <ouzillou_at_meteoritecentral.com>
Date: Tue, 1 May 2012 07:51:58 -0700
Message-ID: <013e01cd27a9$f598f1d0$e0cad570$_at_com>

Thank you all for your responses. Very helpful!

Mendy

-----Original Message-----
From: MexicoDoug [mailto:mexicodoug at aim.com]
Sent: Monday, April 30, 2012 9:12 AM
To: bolidechaser at yahoo.com; ouzillou at yahoo.com
Cc: meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Sutter's Mill/Lotus/? bolide physics at the
time of breakup

Hi Mendy and Bob, Listees;

Yes, the "explosion", which is not an explosion in a chemical sense, does
involve an altering of trajectory, rather than arbitrarily saying toward the
ground, theory goes it is in a direction perpendicular to the trajectory due
to energy of the differential pressure on front vs.
back faces of fragments. But that is thought to be spent in theoretical
cases at about 5-10 times the diameter of the bolide - and the downfield
projection on the ground is the elliptical sectioning which has the added
fractionation of heavier pieces having more momentum to carry further
forward..

So in actuality the explosion might better be termed a "flowering".
The so called kiloton "energy" widely quoted, has huge assumptions since
each case is unique depending on the conditions of the meteoroid, but I
think it is generally just some clever guess at how a pressure wave relates
to size and how to estimate all of the 0.5mv^2 kinetic energy of the
meteoroid projectile, which I doubt instruments can detect as an integrate
whole, just a wild order of magnitude, and rather have to make assumptions
how quickly the bolide-bud flowers.
Just a guess, so hopefully someone who does can explain more. But based on
this theory, no provisions are for more than a symmetrical statistical
distribution of fragments that I know. Your question in a practical sense
would be, is everything so uniform, or might a few outlying pieces get a
disproportionate amout of energy to be sent out.
I don't see why not.

kindest wishes
Doug




-----Original Message-----
From: Robert Verish <bolidechaser at yahoo.com>
To: Mendy Ouzillou <ouzillou at yahoo.com>
Cc: Meteorite-list Meteoritecentral
<meteorite-list at meteoritecentral.com>
Sent: Mon, Apr 30, 2012 11:47 am
Subject: Re: [meteorite-list] Sutter's Mill/Lotus/? bolide physics at the
time of breakup


Strewn field workers have an arkane phrase for this phenomenon called,
"blow-back", which is used to explain anomalies such as reverse
size-grading, or exceptionally large fragments at the very "fine-end" of an
otherwise well size-graded strewn-field.

Bob V.

--- On Mon, 4/30/12, Mendy Ouzillou <ouzillou at yahoo.com> wrote:

> From: Mendy Ouzillou <ouzillou at yahoo.com>
> Subject: [meteorite-list] Sutter's Mill/Lotus/? bolide physics at the
time of
breakup
> To: "'meteoritelist meteoritelist'"
<meteorite-list at meteoritecentral.com>
> Date: Monday, April 30, 2012, 8:21 AM
> I was curious to know if the primary
> bolide breakup event was explosive or
> "simple" fragmentation?
>
> By explosive I mean at the time of the breakup, energy is converted
> somehow that causes some pieces to alter their trajectory and "shoot"
> down to the ground instead of following a normal parabolic trajectory.
>
> Thanks,
>
> Mendy
>
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Received on Tue 01 May 2012 10:51:58 AM PDT