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Daytime O/N2 Retrieval Algorithm for the Ionospheric Connection Explorer (ICON)
Space Science Reviews ( IF 10.3 ) Pub Date : 2018-01-30 , DOI: 10.1007/s11214-018-0477-6
Andrew W. Stephan , R. R. Meier , Scott L. England , Stephen B. Mende , Harald U. Frey , Thomas J. Immel

The NASA Ionospheric Connection Explorer Far-Ultraviolet spectrometer, ICON FUV, will measure altitude profiles of the daytime far-ultraviolet (FUV) OI 135.6 nm and N2 Lyman-Birge-Hopfield (LBH) band emissions that are used to determine thermospheric density profiles and state parameters related to thermospheric composition; specifically the thermospheric column O/N2 ratio (symbolized as Σ$\Sigma$O/N2). This paper describes the algorithm concept that has been adapted and updated from one previously applied with success to limb data from the Global Ultraviolet Imager (GUVI) on the NASA Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) mission. We also describe the requirements that are imposed on the ICON FUV to measure Σ$\Sigma$O/N2 over any 500-km sample in daytime with a precision of better than 8.7%. We present results from orbit-simulation testing that demonstrates that the ICON FUV and our thermospheric composition retrieval algorithm can meet these requirements and provide the measurements necessary to address ICON science objectives.

中文翻译:

电离层连接探索器 (ICON) 的白天 O/N2 检索算法

NASA 电离层连接探索者远紫外光谱仪 ICON FUV 将测量白天远紫外 (FUV) OI 135.6 nm 和 N2 Lyman-Birge-Hopfield (LBH) 波段发射的高度剖面,用于确定热层密度剖面和与热层成分相关的状态参数;特别是热层柱 O/N2 比率(符号为 Σ$\Sigma$O/N2)。本文描述了一种算法概念,该概念已从先前成功应用于 NASA 热层电离层中间层能量学和动力学 (TIMED) 任务中全球紫外线成像仪 (GUVI) 肢体数据的算法概念进行了调整和更新。我们还描述了对 ICON FUV 施加的要求,以便在白天以优于 8.7% 的精度在任何 500 公里样本上测量 Σ$\Sigma$O/N2。
更新日期:2018-01-30
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