Howdy all
Re: the 16 Oct 2021 daytime fireball seen in video from Tucson. On
further examination, the expanding-ring feature on radar appears to be birds
leaving their roosts at daybreak, and it is just a coincidence that it appears
in the same 10-minute GLM exposure as the bolide.
GLM data need to be processed to produce the actual ground track - this
event shows up on both GOES East and GOES West imagery, and each one imposes an
error in actual position based on the viewing angle of the satellite. NASA
Bolides normally does this analysis, but they're slow. Right now their most
recent events are from mid-September: https://neo-bolide.ndc.nasa.gov/#/ It
looks to me like the bolide terminated in northern Mexico from the GLM data,
but again - someone who actually knows how to correct their data needs to have
a go at it.
I drew up an azimuth towards the terminus using the train station video
and Google Earth, and it does appear to coincide with the terminus location
inferred from GLM data. At this point I'm thinking the terminus, was in Mexico
approximately 40 miles south of the US border. The video also shows that the
fireball was quite fast, which may explain why AMS eyewitnesses were all over
the place with their azimuth reports. It also, of course, decreases the
likelihood that any meteorites reached the ground.
I searched for seismometer signatures for this event and came up empty,
but there was only one nearby seismometer with data available yesterday.
Cheers,
Marc Fries
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