Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975cajph..53.1939m&link_type=abstract
Canadian Journal of Physics, vol. 53, Oct. 1, 1975, p. 1939-1947.
Physics
2
Closed Circuit Television, Geminid Meteoroids, Meteoritic Composition, Near Infrared Radiation, Spectrographs, Vidicons, Forbidden Bands, Line Spectra, Luminous Intensity, Meteoroid Showers
Scientific paper
The SEC Vidicon, a low light level closed circuit television system, was used to obtain 137 spectrographic records of meteors at Mt. Hopkins, Arizona, during the Geminid meteor shower in December 1972. Seven of the best Geminid meteor spectra are studied here in detail. The near infrared, out to wavelengths near 9000 A, is recorded for the first time for Geminids. The spectra, in general, exhibit the elements previously found in photographic records of this shower but show a surprising frequency of occurrence of the forbidden green line of O I at 5577 A. This line is normally absent from meteors moving as slowly as the Geminids (36 km/sec) and its presence in these records may be due to the added sensitivity available with the SEC Vidicon. The average green line duration in Geminid meteors with a luminosity near zero absolute visual magnitude is 0.73 sec at a mean height of 95 km, 11 km lower than the green line peak in Perseid meteors of the same luminosity.
Clifton Kenneth S.
Millman Peter M.
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