(meteorobs) Color of photo meteor trails

[Roberto]

Hi Ed,
I have the distribution of the photographed colors of 237 leonids (of 1999
and 2002). I have found that there are of the differences between the 2
years even if leonids only the greens are approximately 55%.
As an example in 1999 I have had some blue meteors but not in 2002.
I know very little English, I have only a good translator! :-)
Clear skies,
Roberto Haver

----- Original Message -----
From: "Ed Majden" <epmajden at shaw.ca>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: Sunday, November 07, 2004 4:25 PM
Subject: Re: (meteorobs) Color of photo meteor trails


> on 11/7/04 2:32, Roberto at me3540 at mclink.it wrote:
>
> > Hi Ed,
> > I do not have the scanner for to digitize the photographies.
> > However I can analyze the colors as I have made for the leonids. As he
said
> > George must be attention to the colors. With the leonids I have tried to
> > make corrections for color index taking as reference various spectral
stars
> > (the photos are not chased).
> > Sorry for the English bad!
> > Clear skies,
> > Roberto Haver
> >
>
> Hi Roberto:
>     Thank you again for your email.  What I am primarily interested in is
> the color of the high altitude portion of the meteor trail for meteors
with
> velocities of less than 40 km/sec.  We have a Leonid photograph which we
> have height data for and the trail starts out green.  High velocity
meteors
> like the Leonids and Perseids often produce the O I forbidden green line
at
> 557.7 nm which is present alone at high altitude, around 10 km higher than
> the rest of the meteor spectrum.  As the meteoroid penetrates lower into
the
> atmosphere other features develop and colors are then blends. The O I
green
> line is only present in meteors having velocities higher than 40 km/sec.
> This is easy to see in meteor spectra.  We are trying to see if the early
> high altitude "green" sometimes recorded is associated with the O I
> forbidden oxygen line at 557.7 nm.  If  this green is also present in slow
> direct meteor tracks we cannot conclude that this is true unless actual
> heights of the meteor are known.
>     Look at your direct color "slow" meteor photographs and let me know if
> any of them show this "green" color at the high altitude end of the meteor
> trail.  I will report your comments to my colleague that is doing the
> analysis of the triangulated Leonid trail.  By the way, your English is
just
> fine, a lot better than my Italian!
>
>     Thank you again and clear skies.
>
> Ed Majden
> Courtenay, B.C.
> Canada
>
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