Differential Meteoric Ablation and its affects in the atmosphere (Invited)

Details Differential Meteoric Ablation and its affects in the atmosphere (Invited) Differential Meteoric Ablation and its affects in the atmosphere (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa12b..02p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA12B-02

Physics

[0335] Atmospheric Composition And Structure / Ion Chemistry Of The Atmosphere, [0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry

Scientific paper

Differential ablation occurs when the constituents of a molten meteoroid evaporate at different rates during the passage of the meteoroid through the upper atmosphere. This can result in relatively volatile elements (e.g., Na and K) evaporating more than 20 km higher than a refractory element such as Ca. This paper will describe a new chemical ablation model (CABMOD) which predicts the ablation rates of individual elements from a meteoroid under specified entry conditions. The model also treats ionization of the individual elements by hyperthermal collisions with air molecules. This data has been used to compute the fine structure in the altitude profile of the "head echo" which would be observed by a large aperture radar. Good agreement was found with observations from the Arecibo radar in Puerto Rico. CABMOD has also been used to explain the curious results of multiple common-volume lidar observations of meteor trails, and to predict the most likely composition of meteoric smoke particles which result from the recondensation of vaporized meteoroids.

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