Meteor wake in high frame-rate images--implications for the chemistry of ablated organic compounds.
Meteor wake in high frame-rate images--implications for the chemistry of ablated organic compounds.
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高帧率图像中的流星尾迹——对烧蚀有机化合物化学的影响。
DOI：
10.1089/153110704773600267
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发表时间：
2004
期刊：
影响因子：
4.2
通讯作者：
H. Stenbaek
中科院分区：
文献类型：
--
作者：
P. Jenniskens;H. Stenbaek
流星消融后，地外有机物可能已被化学改变为更适合生命前化学的形式。我们使用荧光粉衰减时间较短的增强型相机，将流星体的运动冻结在高帧率 1000 帧/秒的视频图像中，从而测量了流星体尾迹中等离子体因流星体后面的强度衰减而冷却的速率。尽管发现最终的冷却速率低于理论预测，但我们的计算表明，在大多数反应性自由基和电子从空气等离子体中损失之前，没有足够的碰撞来分解大的有机化合物。因此，通过流星从太空传送到早期地球的有机分子可能以化学改变的形式幸存下来。此外，我们发现相对较小的流星体会产生远紫外线发射，这些远紫外线发射会被流星体周围的环境吸收，这可能会在比之前认识到的更大的区域内对大气产生化学变化。
Extraterrestrial organic matter may have been chemically altered into forms more ameanable for prebiotic chemistry in the wake of a meteor after ablation. We measured the rate of cooling of the plasma in the meteor wake from the intensity decay just behind a meteoroid by freezing its motion in high frame-rate 1000 frames/s video images, with an intensified camera that has a short phosphor decay time. Though the resulting cooling rate was found to be lower than theoretically predicted, our calculations indicated that there would have been insufficient collisions to break apart large organic compounds before most reactive radicals and electrons were lost from the air plasma. Organic molecules delivered from space to the early Earth via meteors might therefore have survived in a chemically altered form. In addition, we discovered that relatively small meteoroids generated far-ultraviolet emission that is absorbed in the immediate environment of the meteoroid, which may chemically alter the atmosphere over a much larger region than previously recognized.
明亮流星火球后 Na 气辉图像中的结构
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
Kano;A.;Kashiwagi;K.;Takahashi;M.Sone;K.;Shen.C.C.;Hidehiko Suzuki
通讯作者：
Hidehiko Suzuki