(meteorobs) Capturing daytime fireballs?

[Chris Dolman]

Other than reflected radio waves, do meteors produce any of their own
radio frequencies? Or put better, do they produce radio frequencies at
all?


On Fri, 2015-11-13 at 18:11 +0100, Roberto Gorelli wrote:
> On Fri, 13 Nov 2015 09:55:40 -0700
>   Chris Peterson <clp at alumni.caltech.edu> wrote:
> > I don't see how NIR filtering would provide an advantage. Most of 
> >the 
> > optical energy produced by meteors is at shorter wavelengths, and 
> >the 
> > sky continuum is only a little lower in the NIR than elsewhere. So 
> > you're going to throw away a lot of signal, and only slightly reduce 
> >the 
> > noise.
> > 
> > My first approach to a daytime survey camera would be to look at 
> > extending dynamic range. Most video cameras have shallow wells 
> >and/or 
> > poor processing designs. They offer 8-10 bits of output, and their 
> > realistic dynamic range is often much lower. A camera with a good 
> >sensor 
> > and circuitry designed to take advantage of it could give you 70dB 
> >or 
> > more of S/N, which would really assist in pulling out meteors only a 
> > little above the sky background.
> > 
> > If you want to explore filtering, I'd consider narrowband filters 
> > isolating specific emission lines which are common in meteor 
> >spectra- 
> > something from Mg, Na, or O, perhaps. You still have the problem of 
> > rejecting most of your energy, but you essentially remove the 
> >background 
> > completely, so with a sensitive camera you might see an improvement 
> >over 
> > unfiltered results. This would be something interesting to 
> >experiment with.
> > 
> > Chris
> > 
> > *******************************
> > Chris L Peterson
> > Cloudbait Observatory
> > http://www.cloudbait.com
> > 
> > On 11/13/2015 7:00 AM, Thomas Ashcraft wrote:
> >> Are there any specialized camera systems for capturing daytime 
> >>meteors
> >> and/or re-entries?
> >>
> >> Would near infrared filtering enhance chances of video capturing a
> >> daytime fireball?
> >>
> >> Links to papers?
> >>
> >> Thanks in advance.
> >>
> >> Thomas
> 
> Sorry for bad English.
> 
> A daytime bolid it's a very rare event, perharps from a place it can 
> to be saw one time each 10 years or more then I think that nobody 
> should see at it specifically, but if a people want to do this I think 
> that a common camera can took easy a similar event without special 
> accessories, the only accessory that, perharps, can aid it can to be a 
> polarizer filter for to clear the sky. Naturally the camera must never 
> see the Sun.
> Best greetings.
> Roberto Gorelli
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