Abstract
High-Definition TV spectra in the ultraviolet -- visible region were obtained during the 2002 Leonid aircraft campaign. We analyzed 20 meteor spectra obtained from the 1767 (7-revolution) and 1866 (4-revolution) trails on November 19, 2002, and identified the neutral atoms, mainly MgI, FeI, CaI, and NaI in the observed wavelengths between 300--650nm. The singly ionized atomic emissions, CaII and MgII lines, also appeared in the spectrum. The abundances of metallic atoms, the electronic excitation temperature and electron density are obtained for each spectrum, assuming the Boltzmann distribution for the number of each energy level. The metallic abundances of Fe, Ca and Na relative to Mg are slightly lower than solar abundances in average. We could not find out any evidence of space weathering on Leonid meteoroids between 1767 and 1866 trails. We can support the idea that silicate and carbon-mixed silicate are preserved in interplanetary space at least several hundred years. Bands of CHON -- related molecules, such as OH and CN, are not detected in this study.
