Hi Geo,

Since regmaglypts are the result of airflow (and only when it travels relatively fast in sufficiently dense atmosphere), I would suggest that their sizes of regmaglypts are both proportional to the size of the piece when it is subject to the turbulence (requires piece to be moving fast) and possibly get smaller for pieces penetrating to the densest low atmosphere (Sikhote) where the turbulence is much greater. So, a smll piece penetrating far down at great speed, like a low altitude airburst coming off a large iron mass, will produce small, exquisite regmaglypts, while a higher bursting, larger pieces will produce larger regmaglpts.

That said, don't be too sure that everything on the smaller Campos claimed to be a regmaglypt really is. If the piece is small, it's surface had been subjected to a proportionally greater amount of oxidation not to mention the smaller regs are probably long gone in many cases. Larger Sikhotes have larger regmaglypts if you've seen them...

Best wishes
Doug


-----Original Message-----
From: [email protected]
To: [email protected]
Sent: Sun, 7 Jun 2009 10:28 am
Subject: [meteorite-list] Sikhote/Campo regmaglypt size differences



I was wondering if anyone know why the regmaglypts (thumbprints) for
Sikhote-alins seem to be smaller than those found on Campo del Cielos? Perhaps velocity, entry size, atmospheric duration exposure, structure, something
else? Any educated guesses? Any non-educated guesses? :O)
GeoZay

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