Spectra of type‐B red lower borders
Spectra of type‐B red lower borders
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B型红色下边框光谱
DOI：
10.1029/97ja03459
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
C. Deehr
中科院分区：
文献类型：
--
作者：
T. Hallinan;J. Kimball;D. Osborne;C. Deehr
利用微光电视摄像机和电视摄谱仪研究了具有B型红色下边界的极光的颜色随仰角的变化。人们发现，通常被称为B型极光的大部分现象是由迅速的红色和蓝色氮分子发射与持久的绿色氧线之间的简单分离造成的。红色和蓝色的发射联合收割机产生了洋红色，出现在快速移动的极光特征的前沿。真正的B型极光，不依赖于运动，被观察到是由于低海拔绿色线的抑制，可能是由于淬火。虽然绿色的淬灭是主要的效果，但还有，另外，由于与极光边缘现象相关的增强的红/蓝比率（沿极光幕的下边界沿着增强的亮度带）而导致的洋红的色调变化。在一种情况下，也有证据表明氮的第一个正带的强度重新分布，可能是由Benesch [1981]提出的从W态到B态的碰撞间能量转移。总而言之，已经找到证据支持B型极光的每一个主要理论，并且各种机制可以共存。
A low-light-level television camera and a television spectrograph were used to study the variation of color with elevation angle in auroras having type-B red lower borders. It was found that much of what is commonly described as type-B aurora results from a simple separation between the prompt red and blue molecular nitrogen emissions on the one hand and the persistent green oxygen line on the other hand. The red and blue emissions combine to produce magenta which appears on the leading edge of rapidly moving auroral features. True type-B aurora, not dependent on motion, was observed to result from a suppression of the green line at low altitudes, presumably due to quenching. While the quenching of the green is the predominant effect, there are, in addition, changes in the shade of magenta resulting from an enhanced red/blue ratio associated with the phenomenon of auroral hems (bands of enhanced luminosity along the lower borders of auroral curtains). In one case there was also evidence for a redistribution of the intensities of the nitrogen first positive bands, possibly by intercollisional transfer of energy from the W states to the B states as proposed by Benesch [1981]. In sum, evidence was found to support each of the prominent theories for type-B auroras and that the various mechanisms can coexist.