Evaporation of high speed sporadic meteors

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Abstract

Recent measurements conducted at the Arecibo Observatory report high-speed sporadic meteors having velocities near 50 km/s. The results seem to indicate a bimodal velocity distribution in the sporadic meteors (maxima at ∼20 km/s and ∼50 km/s). The particles have a maximum mass of ∼1 μg. This paper will present an analysis of the ablation of 1 μg meteoroids having velocities of 20, 30, 50, and 70 km/s. The calculations show that there is fractionation even for the fast meteoroids, the effect being particularly noticeable for the 1 μg sporadic particles, and less so for the heavier particles. The relevance of the calculations to the radar observations of the sporadic meteors will be discussed. © European Geosciences Union 2004.

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Murad, E., & Roth, C. (2004). Evaporation of high speed sporadic meteors. Atmospheric Chemistry and Physics, 4(3), 737–740. https://doi.org/10.5194/acp-4-737-2004

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