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Chemical abundances determined from meteor spectra: I. Ratios of the main chemical elementsTrigo-Rodríguez, J. M.; Llorca, J.; Borovička, J.; Fabregat, J. (The Meteoritical Society, 2003-01-01)Relative chemical abundances of 13 meteoroids were determined by averaging the composition of the radiating gas along the fireball path that originated during their penetration into the Earth's atmosphere. Mg, Fe, Ni, Cr, Mn, and Co abundances, relative to Si, are similar to those reported for CI and CM carbonaceous chondrites and interplanetary dust particles. In contrast, relative abundances of Ca and Ti in meteor spectra indicate that these elements suffer incomplete evaporation processes. The chemical composition of all meteoroids studied in this work differs from that of 1P/Halley dust.