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Re: (meteorobs) Question on Leonid color
Mike:
Your probably seeing the so called auroral green line of O I at 557.7 nm
at the beginning of the meteor trail. This line is present alone for part
of the time as it appears approximately 10 km higher than the main spectrum
thus the colour is just the green line. It is also persistent, lasting up
to 1 or 2 seconds where most of the other lines decay more quickly. Once
the other spectral lines develop the colour you see, is of course a blend of
all the lines that are present. It is difficult to say which lines dominate
at this time. High velocity meteors such as the Leonids and Perseids have
strong emission Ca+ H&K lines at the blue end of the spectrum and could
appear whitish. Na I and Mg I lines can be strong at this time along with
lines of Fe. The O I green line is often present in fast meteors.
Ed Majden
----- Original Message -----
From: Mike Boschat <aa063@chebucto.nsdot ca>
To: Meteor <meteorobs@atmob.org>
Sent: Thursday, November 22, 2001 11:55 AM
Subject: (meteorobs) Question on Leonid color
> Hello:
>
> I'm curious about something, why are some of the Leonids that were
> photographed by different people start off as green then go to orange-red
> then white? Is this just the film quality or the actually color of the
> meteor?
>
> Mike
> The archive and Web site for our list is at http://www.meteorobs.org
> If you are interested in complete links on the upcoming LEONIDS, see:
> http://www.meteorobs.org/storms.html
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The archive and Web site for our list is at http://www.meteorobs.org
If you are interested in complete links on the upcoming LEONIDS, see:
http://www.meteorobs.org/storms.html
To stop getting email from the 'meteorobs' list, use the Web form at:
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