(meteorobs) Question

[Ed Majden]

Pavol et all:
    What you say is true, but the OI green line in general is only present in fast meteors and not all of them.  I have seen many bright Perseid spectra that don't have a strong green line or often none at all. One other factor related to the OI green line it is a persitent radiation lasting as long as a few seconds long after the other spectral lines have disappeared. One odd thing is the green line is most often present in fast faint meteors secured with image intensifier spectrographs.  An odd thing I have notices is Gale A. Harvey's faint meteor spectra patrol using fast Maksutov film spectrographs often did not record the OI line but Image Intensifier spectra seem to show it all the time. I'm not sure why.  Maybe a professional has a view point on this. Mg I  in the green region of the spectrum is a strong feature in most spectra along with some other lines in this region.  I would think they would be more of a contributer to the green color for most meteors.  As for Perseid meteors the color is shifted to the blue end because of the strong presents of the Ca+ H&K lines etc.  Color of course is a blend of all the lines present in the mteor spectrum.  On another point our vision peeks in the green region so this is a factor also.  You can see some of my spectra on my home page at:  http://members.shaw.ca/majden/index.htm

Ed Majden - Amateur Meteor Spectroscopist - AMS


  ----- Original Message ----- 
  From: Pavol Habuda 
  To: Meteor science and meteor observing 
  Sent: Friday, June 03, 2011 8:27 AM
  Subject: Re: (meteorobs) Question


  Green line is 557.7nm forbidden (atomic) oxygen line. It is common for fast meteors for their afterglows. Total amount of light (integral intensity) in green line is few times of total intensity of actual meteor. Depending on various conditions (most important is height) you se either trace after meteor, or meteor of green color.

  Pavol Habuda


------------------------------------------------------------------------------
  From: drobnock <drobnock at penn.com>
  To: "meteorobs at meteorobs.org" <meteorobs at meteorobs.org>
  Sent: Friday, June 3, 2011 4:47 PM
  Subject: (meteorobs) Question

  There has been much discussion of late about "green" meteors and
  fireballs. The phenomena of the green meteor historically became a rally
  point for observes in the 1940's under Lincoln LaPaz.  And the "red
  scare" of the 1950's. Now for the past year or so this colour green is
  quite popular. Why? What is the significance for observers to view green
  meteors? And can any one give an explanation about the composition of
  the spectrum of a "green" meteor as opposed to the spectrum analysis of
  a "bluish" fireball?

  George John Drobnock

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