Hi Marc and Steve and all,
My comment that the radar information was off was because of an error in the
camera location to begin searching the radar data?
Garbage in = Garbage out.
Rob figured that out and Jim Gamble confirmed Rob's findings.
So, my statement seems to be true in at least one instance. Not the fault
of the radar and I felt the frustration!
I think fine tuning on where the information to research comes from is key
and it's improving all the time.
Marc, do you have HAS numbers I could bum? I am not actively searching this
one, just want to see what you are seeing.
It's a little surprising that this fireball was not clearly distinguished
and Id'ed on radar in my mind. Why do you think that is???
As a point of information, at least on the Sky Sentinel network, the node
operator can create a movie, regardless of the "event" capture timing.
I can set the event capture to a very low time. Because it is there to
capture an event, all I need is the beginning time to then go back and make
a movie that will "see" the entire event plus added time prior and after to
determine any kind of flash, etc., many seconds after the event leaves my
horizon. It's easy and only takes a few minutes to do. IOW's, the movie,
is only dependent on the event capture to get a relative time to begin...and
that's it.
Knowing this, the radar guys (me included) can then call or email the node
operator directly and get the correct information and data....the keyword
being "directly".
Some operators, like me, may even order up the HAS data and have that being
processed, so that order number can be shared as well, which can save some
time as well when contacted!
In regards to the sonic booms, that's great to hear all the witnesses heard
it. However, have there been any time delays recorded? I have not seen any
posted.
Kind regards,
Jim
Jim Wooddell
https://k7wfr.us
Parker Sentinel SkyCam
----- Original Message -----
From: "Marc Fries" <[email protected]>
To: <[email protected]>
Sent: Tuesday, February 07, 2012 10:16 AM
Subject: Re: [meteorite-list] 2nd Report from Strewnfield in Edgewood Texas
Rather quietly and "behind the scenes", there has been a lot of work
developing the use of weather radar to detect meteorites, by Rob Matson,
Jake Schaefer, myself, my brother, and others. It's been a tall learning
curve but I think we've made a lot of progress. In my opinion, the
biggest "unknown" left at this point is to figure out what size of
meteorites and/or other debris actually show up best in radar data. The
radar reflections we see are not only reflections off of solid objects but
also from atmospheric turbulence. And we also have to unravel the knot of
reflections in the Mie scattering regime, where the reflected signal
strength varies widely - and nonlinearly - with the size of the reflector.
The upshot is that we are still working on sorting out what radar
reflection equates to what size of meteorite. If we see a radar
reflection, is it from search-worthy stones or just a cloud of ~1g rocks,
or even ablation spherules? A good part of that is just a matter of
timing, but not all of it. Lorton, for example, produced a strong radar
signature in TDWR radar data but nothing was found beyond the original
doctors'-office-smasher, suggesting that we were looking at a swarm of
tiny rocks....? The same is true for the Jacksonville, IL event.
This DFW fireball appears to come from a well-consolidated object that
survived a long "burn" time with little in the way of fragmentation. West,
TX, by comparison, fragmented extensively and produced a beautiful, easy
to follow set of radar signatures. My take on the DFW fireball is that
we're looking for a small number of large rocks that reached the ground
quickly, producing a short-lived radar signature that requires some degree
of luck to figure out. ...or are we looking at 1g stones that no one is
going to find? Just having that answer in hand will tell us a lot about
where to look.
Still working on it...
Cheers,
Marc Fries
On 2/7/12 8:46 AM, Steve Dunklee wrote:
The radar data is not off. It is just not understood by most people how
the parabola of a fall can cause the actual landing area to be up to 12
miles away from the radar data. If you stick a french curve in an apple
to represent the west to east fall. the termination point is north to
northwest of the radar data.
Cheers
Steve Dunklee
--- On Tue, 2/7/12, Jim Wooddell<[email protected]> wrote:
From: Jim Wooddell<[email protected]>
Subject: Re: [meteorite-list] 2nd Report from Strewnfield in Edgewood
Texas
To: "Dennis Miller"<[email protected]>,
[email protected], [email protected]
Date: Tuesday, February 7, 2012, 4:29 PM
Hi All!
I thought it was determined the Radar data was off???
And, it really is not a strewn filed until one is actually
found!
Cheers!
Jim
Jim Wooddell
http://k7wfr.us
----- Original Message -----
From: "Dennis Miller"<[email protected]>
To:<[email protected]>;
<[email protected]>
Sent: Tuesday, February 07, 2012 8:55 AM
Subject: Re: [meteorite-list] 2nd Report from Strewnfield in
Edgewood Texas
Nice! I am so glad you didn't set the public price too
high, like
Thousands
for Ash Creek. :-) I do hope you are successful in your
hunt. Keep us
posted.
Missed you in Tucson! Again, Good Luck!
Dennis Miller
From: [email protected]
To: [email protected]
Date: Mon, 6 Feb 2012 22:17:55 -0700
Subject: [meteorite-list] 2nd Report from
Strewnfield in Edgewood Texas
Nothing has been found where the radar data said it
might be. Torvald
and Donavan have left the zone replaced by Stephen
Thompson out of
Fredricksburg TX who is an expert on Sonic Boom
characteristics.
I've been lucky enough to get some media attention
to try to motivate
the public to assist here is today's interview on
TV. This is the 5 TV
interview I've given since arriving.
http://dfw.cbslocal.com/video/6713580-meteor-hunters-scouring-north-texas/
We spent the day interviewing more witnesses&
compiling and extending
the range of sonic boom farther to the east to
include Wills Point, and
southern Lake Tawakanii.
We'll do some field samplings tomorrow east of 19.
Also as a warning. I've heard from a local that the
landowner who owns
the land in the north where the upper radar blip
is, has gotten very
hostile to all outsiders. The local warned me to
tell everyone to stay
off that property. He thinks the landowner may
shoot to wound or maim.
So I'd like everyone to take that threat to heart.
At this point, we have two new important
observations and think the
strewnfield to be east of 19 now.
At this point, there have been no Z sightings, but
the Black Panther
remains a constant threat. 5 dogs were killed.
Also, the park rangers
at the state park warned us that a mountain lion
has been spotted in the
area.
Some sonic boom activity has been traced back to
some individual using
some kind of reactive explosive that detonates when
shot by a bullet.
The local police has informed us this has been a
bit of a problem for
weeks. Consequently, it really screws up our
acoustical survey.
and a mention and big hand to Dirk Ross, David
Gonzales, and Marc Fries
for giving us back support.
-mccartney taylor& stephen thompson
(meteorite hunter) (offical panther bait)
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