New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN
New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN
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MAVEN 上的 IUVS 对火星高层大气中分子氮的新观测
DOI：
10.1002/2015gl065319
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发表时间：
2015
影响因子：
5.2
通讯作者：
B. Jakosky
中科院分区：
文献类型：
--
作者：
M. Stevens;Joseph Evans;N. Schneider;A. Stewart;J. Deighan;S. Jain;M. Crismani;A. Stiepen;M. Chaffin;W. McClintock;G. Holsclaw;Franck Lefèvre;D. Lo;J. Clarke;F. Montmessin;S. Bougher;B. Jakosky
我们确定分子氮（N2）的排放在火星上层大气中使用的成像紫外光谱仪（IUVS）的火星大气和挥发性演变（MAVEN）的使命。我们报告了在火星上对N2莱曼-伯奇-霍普菲尔德（LBH）带的首次观测，并确认了N2 Vegard-卡普兰（VK）带的初步识别。我们检索N2密度分布从VK肢体排放和比较计算的肢体辐射90和210公里之间的观测和预测从火星大气环流模型（GCM）。相反，早期的分析使用其他卫星数据，我们发现，N2丰度超过GCM结果约2倍，在130公里，但在150公里的协议。的分析和解释，使线性回归方法用于提取紫外光谱IUVS临边观测的组件。
We identify molecular nitrogen (N2) emissions in the Martian upper atmosphere using the Imaging Ultraviolet Spectrograph (IUVS) on NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. We report the first observations of the N2 Lyman‐Birge‐Hopfield (LBH) bands at Mars and confirm the tentative identification of the N2 Vegard‐Kaplan (VK) bands. We retrieve N2 density profiles from the VK limb emissions and compare calculated limb radiances between 90 and 210 km against both observations and predictions from a Mars general circulation model (GCM). Contrary to earlier analyses using other satellite data, we find that N2 abundances exceed GCM results by about a factor of 2 at 130 km but are in agreement at 150 km. The analysis and interpretation are enabled by a linear regression method used to extract components of UV spectra from IUVS limb observations.