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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We calculated equilibrium chemical composition of a mixture of meteoritic vapor and air during fireball
events, i.e. during penetration of large meteoroids into terrestrial atmosphere. Different types of fireballs
were considered, and calculations were performed for wide ranges of temperatures and pressures. Chemical
composition at the quenching point was estimated by comparison of hydrodynamic and chemical
reaction time scales. For the typical fireball temperatures of 4000–5000 K, most elements are expected
to be in the form of atoms and ions. Notable exceptions are Si and C, which are expected to be mainly
in the form of SiO and CO. Other molecules abundant at these temperatures are N2 and NO. Metal monoxides
are most abundant at 2000–2500 K and are formed during the cooling phase. Conditions for formation
of other molecules such as Nþ2
, CN, C2 and OH were also considered. The composition of freshly
ablated meteoroid material was studied using the MAGMA code.