From: Martin Shough <parcellular.nul> Date: Thu, 12 May 2011 18:37:21 +0100 Archived: Fri, 13 May 2011 04:35:43 -0400 Subject: Re: Radar Detection Of UFOs >From: Ralph Howard <rhjr.nul> >To: post.nul >Date: Thu, 12 May 2011 08:55:27 -0700 (PDT) >Subject: Radar Detection Of UFOs [was: SETI Summary] ><snip> >Concerning radar detection, just an FYI for everyone's use... In >looking into the potential for use of NEXRAD weather radar data >in UFO sighting investigations, I recently found that there is a >"scientist and meteorite hobbyist", a Ph.D. fellow at the >Planetary Science Institute in Tucson AZ, who runs a >blog/website devoted to providing NEXRAD weather radar data as >a resource for finding meteorites. Additional quotes from Dr. >Marc Fries' blog: >http://radarmeteorites.wordpress.com/ >"It turns out that Doppler weather radars are a valuable resource >for not only finding meteorites from fresh falls but also for >studying the dynamics of the fall itself. In the US, the NEXRAD >radar network operated by NOAA provides continuous coverage of >most of the US landmass. Any meteorites that fall here have to >fall through airspace that is monitored by NEXRAD, and when the >conditions are right we can spot them on the way down." Thanks, Ralph, very interesting. I'm surprised that NEXRAD is thought to have much of a role here, though, because coverage is so restricted. The NEXRAD uses a narrow 1-degree pencil beam and a selection of different scan algorithms to build up coverage in a series of 1- degree slices at a ponderously slow rate, between about 5 and 10 _minutes_ depending on mode. This compares with a typical surveillance radar that fills the same scan volume in as many _seconds_. (Of course they aren't looking for primary targets like meteors, but you get the point). The most sensitive (clear air) NEXRAD mode only covers the sky up about 4 or 5 degrees elevation anyway, and the less-sensitive precip[itation modes still only go up to about 19 degrees and take 5 or 6 minutes to do it. So I should have thought that even with overlapping coverages the chances are very small of spotlighting a useful number of 1-degree pieces of meteor trail so as to build up a track - when a typical trail is gone in seconds . And the wavelength is short , too - 10cm S-band - not ideal for ionisation returns, which are favoured at very long wavelengths. <snip> >... keeping up with this website makes a lot of >sense, because of the potential for NEXRAD recording something >anomalous. It is intriguing. I want to take a closer look. Thanks for the tip. Martin Shough Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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