[meteorite-list] Portales Valley and PF SF's
From: Mark Jackson <chaositymeteoritics_at_meteoritecentral.com>
Date: Thu Apr 22 10:18:02 2004 Message-ID: <20031220042710.31324.qmail_at_web11705.mail.yahoo.com> --0-1879168074-1071894430=:30620 Content-Type: text/plain; charset=us-ascii Dear List, To continue our musings on strewnfields, I'd like to first clarify Adam's post earlier when he identified strewnfields as the fall pattern of meteorites that break up prior to impact (Park Forest, etc.). This would be fine with me but it suggests we need new/different terminology to describe post impact distributions of impact created fragments (Canyon Diablo, etc.). Some would ask why and the reason is before us; it's hard to understand and study something without specific language. To that end, I'm trying to resolve in my mind why the Portales Valley SF was essentially the reverse of the expected weight distribution. My instinct is to suggest that there was a moderate to strong tailwind in the upper atmosphere that pushed the lighter material "past" the heavier pieces so as to make it seem to have fallen in reverse pattern. Maybe Rob can help us there. I remember that the PF upper level winds were left to right and made the SFseem to elongate in a perpendicular fashion to the velocity vector. Happy Holidays guys! Mark Jackson Chaosity Meteoritics chaositymeteoritics_at_yahoo.com --------------------------------- Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing --0-1879168074-1071894430=:30620 Content-Type: text/html; charset=us-ascii <DIV>Dear List,</DIV> <DIV> </DIV> <DIV>To continue our musings on strewnfields, I'd like to first clarify Adam's post earlier when he identified strewnfields as the fall pattern of meteorites that break up prior to impact (Park Forest, etc.). This would be fine with me but it suggests we need new/different terminology to describe post impact distributions of impact created fragments (Canyon Diablo, etc.). Some would ask why and the reason is before us; it's hard to understand and study something without specific language.</DIV> <DIV> </DIV> <DIV>To that end, I'm trying to resolve in my mind why the Portales Valley SF was essentially the reverse of the expected weight distribution. My instinct is to suggest that there was a moderate to strong tailwind in the upper atmosphere that pushed the lighter material "past" the heavier pieces so as to make it seem to have fallen in reverse pattern. Maybe Rob can help us there. I remember that the PF upper level winds were left to right and made the SFseem to elongate in a perpendicular fashion to the velocity vector.</DIV> <DIV> </DIV> <DIV>Happy Holidays guys!</DIV><BR><BR><DIV><FONT face="comic sans ms" color=#c00000 size=5><EM>Mark Jackson</EM></FONT></DIV> <DIV><FONT face=verdana>Chaosity Meteoritics</FONT></DIV> <DIV><FONT face="Arial Narrow" color=#438059 size=3><A href="mailto:chaositymeteoritics_at_yahoo.com">chaositymeteoritics@yahoo.com</A></FONT></DIV> <DIV> </DIV><p><hr SIZE=1> Do you Yahoo!?<br> <a href="http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=21260/*http://photos.yahoo.com">New Yahoo! Photos - easier uploading and sharing</a> --0-1879168074-1071894430=:30620-- Received on Fri 19 Dec 2003 11:27:10 PM PST |
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