Wisconsin Meteor - A Great Time to Play with Radar Data

As I'm sure you've heard by now last week, what is believed to be a meteor, passed into our atmosphere and exploded over Wisconsin.  The light was seen as far away at St.Louis, MO and was captured on a camera at the University of Wisconsin-Madison.  The video frames have been played on most news networks and are available everywhere online.
As you can imagine the 911 call center (actually 911 call centers over 6 states) was/were flooded with reports of the light, the sonic boom, and other observations.  The NWS also noticed a new trail appear on the radar.  I downloaded the level 2 data and plotted it up.  First we'll look at the reflection.

You can see the trail in the SW corner of Iowa county.  (KDVN radar)  Next is just a blow up of this image.  The meteor path was from west to east.  According to NASA scientists the meteorite was likely not from the current Gamma Virginids meteor shower, but a rock from the asteroid belt.
Next it would be interesting to look at this trail in 3D.  Using level II radar data this is possible.  The next images show this from several different angles.   The directions are labeled so it's easy to get bearings on which way you're looking.  If you notice the trail is sloping down slightly towards the SE.

The average hight for the event was right around 24,000-25,000 ft.  Looking at the plot you can see how small the plot was and how large the strongest reflector in the center is! A few back of the envelope calculations can be done using basic trig to determine some interesting things.  You can try this yourself.  I've posted a link to the radar data at the bottom and a link to a website where you can download a 21 day trail of GR2Analyst.  Just open the data and start slicing it!

Finally a sample of the meteorite has been recovered at is being examined currently.  There should be many other samples in the area also and hunters are already out looking for them.  With all this in mind you should remember it's not that uncommon for meteorites to enter the atmosphere.  Washing machine size chunks of rock are not abnormal and they burn up in the atmosphere.  If any material makes it to the ground it's probably never seen.  (Since most of the Earth is covered in water most probably hit there.)
 
Below: Scientists prepare a sample of the meteorite for a test


LINKS:
Gibson Ridge Software
Data for This Radar Scan

3 responses to “Wisconsin Meteor - A Great Time to Play with Radar Data

  1. It reminds me this paper that use seismic data to study the explosion:
    http://srl.geoscienceworld.org/content/84/6/1021

    All these are interesting data, but the data link from your post seems not working.

    • Yes! Looking on meteor signals on seismometers and radar systems can be very fascinating. Fry and Fry have published a lot on the radar, there have also been quite a few infrasound papers as well.

      The data link is dead :/ It goes to a server that doesn't exist anymore - I've added it to the list of things to address! Thanks for catching it.

  2. Pingback: Episode 162 – “Glowing ball of valuable metal” | Don't Panic Geocast

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