期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 15, 页码 6518-6525出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065149
关键词
cosmic dust; comets; meteor radar; meteoric ablation; cosmic spherules; mesospheric metals
资金
- European Research Council [291332]
- NASA's Solar System Works
- NASA [12-PAST12-0007, 12-PATM12-0006]
- Natural Environment Research Council [ncas10006] Funding Source: researchfish
- NERC [ncas10006] Funding Source: UKRI
The size and velocity distribution of cosmic dust particles entering the Earth's atmosphere is uncertain. Here we show that the relative concentrations of metal atoms in the upper mesosphere, and the surface accretion rate of cosmic spherules, provide sensitive probes of this distribution. Three cosmic dust models are selected as case studies: two are astronomical models, the first constrained by infrared observations of the Zodiacal Dust Cloud and the second by radar observations of meteor head echoes; the third model is based on measurements made with a spaceborne dust detector. For each model, a Monte Carlo sampling method combined with a chemical ablation model is used to predict the ablation rates of Na, K, Fe, Mg, and Ca above 60km and cosmic spherule production rate. It appears that a significant fraction of the cosmic dust consists of small (<5 mu g) and slow (<15 kms(-1)) particles.
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