Thank you all for your responses. Very helpful! Mendy
-----Original Message----- From: MexicoDoug [mailto:[email protected]] Sent: Monday, April 30, 2012 9:12 AM To: [email protected]; [email protected] Cc: [email protected] 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 <[email protected]> To: Mendy Ouzillou <[email protected]> Cc: Meteorite-list Meteoritecentral <[email protected]> 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 <[email protected]> wrote: > From: Mendy Ouzillou <[email protected]> > Subject: [meteorite-list] Sutter's Mill/Lotus/? bolide physics at the time of breakup > To: "'meteoritelist meteoritelist'" <[email protected]> > 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 > > ______________________________________________ > > Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
