We report the results of incoherent scatter radar, total power, and ion line observations of a nighttime sporadic layer centered at 92‐km altitude. The height variation of the absolute widths of the ion line yields a layer temperature of 210°±5°K and a mean ion mass of 50±10 amu. This ion mass, when compared with average meteor composition, indicates that the layer is composed totally of metallic ions.
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Tepley et al. (1985) studied this question.
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