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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Impact of a major meteor storm on Earth's ionosphere: A modeling study
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Impact of a major meteor storm on Earth's ionosphere: A modeling study

机译：一次重大流星风暴对地球电离层的影响：一项模型研究

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A comprehensive model of the effect of a major meteor storm on Earth's ionosphere is presented. The model includes meteor stream mass distributions based on visual magnitude observations, a differential ablation model of major meteoric metals, Fe and Mg, and state-of-the-art modeling of the chemistry and transport of meteoric metal atoms and ions subsequent to deposition. Particular attention is paid to the possibility of direct ionic deposition of metallic species. The model is validated by calculating the effect of annual meteor showers on the background metal atom and ion abundances. A metallic ion density increase of up to 1 order of magnitude is observed, in agreement with in situ measurements during showers. The model is exercised for a hypothetical Leonid meteor storm of the magnitude reported in 1966. The model predicts the formation of a layer of metal ions in the ionospheric E region that reaches peak densities of around 1 x 10(5) cm(-3), corresponding to a 2 order of magnitude increase of the quiescent nighttime E region density. Although sporadic E layers reaching or exceeding this density are relatively common, the effect is different in that it persists on the order of days and would be observed over nearly one-half the globe. The model predictions are consistent with the available 1966 Leonid storm data. In particular, the observation of enhanced, predawn sporadic E activity points to efficient collisional ionization of meteoric metals, as assumed in the model. [References: 77]
机译：提出了一个主要的流星风暴对地球电离层影响的综合模型。该模型包括基于视觉幅度观测的流星流质量分布，主要陨石，Fe和Mg的微分烧蚀模型，以及沉积后陨石金属原子和离子的化学和迁移的最新模型。特别注意金属物质直接离子沉积的可能性。通过计算年度流星雨对背景金属原子和离子丰度的影响来验证该模型。观察到金属离子密度最多增加1个数量级，这与淋浴期间的原位测量相符。该模型是针对1966年报道的假设的狮子座流星雨进行的。该模型预测在电离层E区域中形成金属离子层，该金属离子层的峰值密度约为1 x 10（5）cm（-3）。对应于静态E夜间区域密度增加2个数量级。尽管偶发的E层达到或超过此密度是相对常见的，但效果却不同，因为它会持续数天，并且会在地球的近一半处观察到。模型预测与可用的1966年Leonid风暴数据一致。特别是，如模型中所假设的，观察到的增强的，黎明前的零星E活性表明，流星金属发生了有效的碰撞电离。 [参考：77]

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