On the luminous efficiency of meteoritic fireballs

Details On the luminous efficiency of meteoritic fireballs On the luminous efficiency of meteoritic fireballs

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6255r&link_type=abstract

Journal of Geophysical Research, vol. 84, Oct. 10, 1979, p. 6255-6262.

Astronomy and Astrophysics

Astrophysics

9

Astronomical Photometry, Fireballs, Luminous Intensity, Meteorite Collisions, Astrophysics, Atmospheric Entry, Mathematical Models, Meteorites, Luminescence, Velocity, Altitude, Lost City Meteorite, Innisfree Meteorite, Pribram Meteorite, Ablation, Mathematical Models, Cosmic Ray Tracks, Analysis, Photometry, Mass, Photography, Magnitude, Comparisons

Scientific paper

Luminous efficiencies for the Lost City, Innisfree and Pribram meteorites are calculated empirically with respect to a detector peaked in the visible as functions of velocity and altitude. Observed data were combined with ablation rates derived from the atmospheric entry model of ReVelle (1979), taking into account in the kinetic energy balance equation the deceleration of the meteorite in the atmosphere. Results are shown to be in agreement with suitably modified laboratory data, exhibiting a phase lag between maximum ablation and maximum light emission. Luminous efficiency values are found to be approximately 0.2 and 0.4% for Lost City and Innisfree, respectively, near peak ablation, and, less certainly, approximately 0.04% for Pribram. It is concluded that the deduced photometric mass scale of fireballs should be revised downward by a factor of five to ten, so that a more accurate mass influx determination can be made.

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