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Location: UFOUpDatesList.Com > 2011 > May > May 13

Re: Radar Detection Of UFOs

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



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