Atomic nitrogen in aurora: Production, chemistry, and optical emissions
Atomic nitrogen in aurora: Production, chemistry, and optical emissions
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极光中的原子氮：生产、化学和光发射
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
G. Romick
中科院分区：
文献类型：
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作者：
M. Rees;G. Romick
研究了极光中基态氮原子的产生。两个主要的机制是N2的电子碰撞解离和化学离子反应，后者主导了N（²D）的产生。在很大的海拔范围内，60%到70%的N原子是在激发态的²P和²D状态下产生的。在不同的极光条件下，对北方夜侧极光椭圆区N_1的5200-A和3466-A谱线以及N_2 ~+的4278-A第一负群谱带进行了同步场向测量。这些数据是在1978年2月5日晚上连续4小时内获得的，得出5200-A/3466-A谱线的平均发射率比接近0.5。模型计算产率比为0.5和1.4粒子的特征能量（α）为2千电子伏和0.1千电子伏在一个假设的麦克斯韦电子能谱在这里报道的观测结果和文献中报道的非常软的降水在向阳面的尖点区域一致。极光中高能（热）N（4S）原子的产生率是从与N原子产生相关的过量平移能的考虑来评估的。这可能是极光大气中NO生成速率和奇数氮密度的一个重要因素。
The production of ground configuration nitrogen atoms in aurora is investigated. The two principal mechanisms are electron impact dissociation of N2 and chemical-ionic reactions, with the latter dominating the production of N(²D). Between 60 and 70% of the N atoms are produced in the excited ²P and ²D states over a large altitude range. Simultaneous field-aligned measurements of the 5200-A and 3466-A lines of N I and the 4278-A first negative group band of N2+ were made in the northern nightside auroral oval under varying auroral conditions. These data, taken over a continuous 4-hour period on the night of February 5, 1978, yield an average emission rate ratio of the 5200-A/3466-A lines near 0.5. Model calculations yield ratios of 0.5 and 1.4 for particle characteristic energies (alpha) of 2 keV and 0.1 keV in an assumed Maxwellian electron spectrum in good agreement with the observations reported here and consistent with those reported in the literature for very soft precipitation in the dayside cusp region. The production rate of energetic (hot) N(4S) atoms in the aurora is evaluated from considerations of the excess translational energy associated with N atom production. It may be a significant factor in the production rate of NO and the odd nitrogen density in general in the auroral atmosphere.