文章基本信息

标题：Comparison of Reference Heights of O/N2 and ∑O/N2 Based on GUVI Dayside Limb Measurement
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作者：Tingting Yu ; Zhipeng Ren ; You Yu 等
期刊名称：Space Weather
印刷版ISSN：1542-7390
出版年度：2020
卷号：18
期号：1
页码：1-11
DOI：10.1029/2019SW002391
语种：English
出版社：American Geophysical Union
摘要：We define a new thermospheric concept, the reference heights of O/N2, referring to a series of thermospheric heights corresponding to the fixed ratios of O to N2 number density. Here, based on Global Ultraviolet Imager (GUVI) limb measurement, we compare O/N2 column density ratio (∑O/N2) and the reference heights of O/N2. We choose the transition height of O and N2 (transition height hereafter), a special reference height at which O number density is equal to N2 number density, to verify the connection with ∑O/N2 during geomagnetically quiet periods. It is found that transition height and ∑O/N2 have noticeable negative correlation with correlation coefficient of -0.887. An empirical model of transition height (O/N2 model hereafter) is established based on nonlinear least-squares-fitting method. The considerable correlation (greater than 0.96), insignificant errors (less than 4%) and the great influencing weight of ∑O/N2 to reference heights indicate the validity of O/N2 model and the existence of quantitative relation between ∑O/N2 and transition height. Besides, it is verified that the similar quantitative relation also exists between ∑O/N2 and reference heights of other O/N2 values. Namely, using the O/N2 model coefficients, we can roughly get the whole altitude profiles of O/N2 within 6% precision for any given ∑O/N2.