Lidar observations of elevated temperatures in bright chemiluminescent meteor trails during the 1998 Leonid Shower
Lidar observations of elevated temperatures in bright chemiluminescent meteor trails during the 1998 Leonid Shower
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DOI：
10.1029/2000gl000080
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发表时间：
2000-07
影响因子：
5.2
通讯作者：
X. Chu;A. Liu;G. Papen;C. Gardner;M. Kelley;J. Drummond;R. Fugate
中科院分区：
文献类型：
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作者：
X. Chu;A. Liu;G. Papen;C. Gardner;M. Kelley;J. Drummond;R. Fugate
在1998年11月17日至18日狮子座流星雨高峰期间，在新墨西哥州星火光学靶场用可操纵的Na风/温度激光雷达探测了与明亮火球相关的七条持久尾迹。这些化学发光轨迹特别富含Na。尾迹中的平均Na丰度是背景Na层丰度的52%，这表明流星的相应质量从1 g到1 kg。CCD图像显示，荧光发射（包括Na和OH）被限制在管壁，随着时间的推移，通过分子扩散而膨胀。激光雷达在轨迹内的剖面显示，温度最高的是在管的边缘，那里的气辉发射最亮。烧蚀后约3分钟，管壁温度比管芯和背景大气温度高20 - 50 K。无论是化学加热还是摩擦加热都不能对观测结果提供令人满意的解释。
Seven persistent trails associated with bright fireballs were probed with a steerable Na wind/temperature lidar at Starfire Optical Range, NM during the 17/18 Nov peak of the 1998 Leonid meteor shower. These chemiluminescence trails were especially rich in Na. The average Na abundance within the trails was 52% of the background Na layer abundance, which suggests that the corresponding masses of the meteors were from l g up to 1 kg. CCD images show that the chemiluminescent emissions (including Na and OH) are confined to the walls of a tube, which expands with time by molecular diffusion. Lidar profiles within the trails show that the temperatures are highest at the edges of the tube where the airglow emissions are brightest. Approximately 3 min after ablation, temperatures at the tube walls are 20–50 K warmer than the tube core and background atmosphere. Neither chemical nor frictional heating provides a satisfactory explanation for the observations.