VIDEO SPECTRA OF LEONIDS AND OTHER METEORS

摘要

Video spectra of 33 meteors of medium brightness (+1 to -1 mag) were compared. The intensity of the main meteoric emissions of Mg, Na, Fe, and atmospheric emissions of N_2, O, N were studied. The Na/Mg ratio is different in different meteors, showing variations in Na abundance. Moreover, much earlier ablation of Na during the atmospheric entry than of other elements observed in some Leonids and one Orionid, Quadrantid and Leo Minorid evidences fragile structure of those meteoroids. One sporadic meteor was completely deficient in sodium. The strength of atmospheric emissions increases with increasing meteor velocity. Taurids are notable by the near-absence of O and N emissions.