Dye‐laser observations of the nighttime atomic sodium layer
Dye‐laser observations of the nighttime atomic sodium layer
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DOI：
10.1029/ja077i034p06839
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发表时间：
1972-12
影响因子：
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通讯作者：
R. Hake;D. E. Arnold;D. Jackson;W. Evans;B. Ficklin;R. L. Long
中科院分区：
文献类型：
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作者：
R. Hake;D. E. Arnold;D. Jackson;W. Evans;B. Ficklin;R. L. Long
作为可调谐染料激光雷达性能测试的一部分，对90公里附近的自由钠原子层进行了观测。在1971年秋天的四个夜晚的部分时间里获得的该层的高度剖面与其他小组获得的高度剖面是一致的，但显示出两个有趣的附加特征。第一种是密度急剧下降，在中层顶附近的可变高度处终止底侧的层。这种减少似乎在黄昏后的一段时间内变得急剧，这表明随着夜间化学物质的建立，钠的消耗机制发生了变化。第二个特征是在1971年12月13日至14日双子座流星雨辐射过境的4小时内，钠层含量增加了四倍，当时流星雨处于高峰期。
Observations of the free atomic sodium layer near 90 km have been made as part of performance tests on a tunable dye-laser radar. Altitude profiles of the layer obtained during parts of four nights in the fall of 1971 are consistent with those obtained by other groups but show two interesting additional features. The first is a sharp decrease in density that terminates the layer on the bottom side at a variable altitude near the mesopause. This decrease appears to become sharp only some time after twilight, suggesting that the sodium consumption mechanism undergoes a change as the nighttime chemistry is established. The second feature is a fourfold increase in sodium-layer content during a 4-hour period surrounding the transit of the radiant of the Geminids meteor shower on the night of December 13–14, 1971, when the shower was at its peak.