Solar control of CO_2~+ ultraviolet doublet emission on Mars
Li Zichuan1; Cui Jun2; Li Jing2; Wu Xiaoshu1; Zhong Jiahao2; Jiang Fayu3
Source PublicationEarth and Planetary Physics
AbstractThe CO_2~+ ultraviolet doublet (UVD) emission near 289 nm is an important feature of dayside airglow emission from planetary upper atmospheres.In this study, we analyzed the brightness profiles of CO_2~+ UVD emission on Mars by using the extensive observations made by the Imaging Ultraviolet Spectrograph on board the recent Mars Atmosphere and Volatile Evolution spacecraft.Strong solar cycle and solar zenith angle variations in peak emission intensity and altitude were revealed by the data: (1) Both the peak intensity and altitude increase with increasing solar activity, and (2) the peak intensity decreases, whereas the peak altitude increases, with increasing solar zenith angle.These observations can be favorably interpreted by the solar-driven scenario combined with the fact that photoionization and photoelectron impact ionization are the two most important processes responsible for the production of excitedstate CO_2~+ and consequently the intensity of CO_2~+ UVD emission.Despite this, we propose that an extra driver, presumably related to the complicated variation in the background atmosphere, such as the occurrence of global dust storms, is required to fully interpret the observations.In general, our analysis suggests that the CO_2~+ UVD emission is a useful diagnostic of the variability of the dayside Martian atmosphere under the influences of both internal and external drivers.
KeywordMars dayglow CO_2~+ MAVEN
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Zichuan,Cui Jun,Li Jing,et al. Solar control of CO_2~+ ultraviolet doublet emission on Mars[J]. Earth and Planetary Physics,2020,4(6):543.
APA Li Zichuan,Cui Jun,Li Jing,Wu Xiaoshu,Zhong Jiahao,&Jiang Fayu.(2020).Solar control of CO_2~+ ultraviolet doublet emission on Mars.Earth and Planetary Physics,4(6),543.
MLA Li Zichuan,et al."Solar control of CO_2~+ ultraviolet doublet emission on Mars".Earth and Planetary Physics 4.6(2020):543.
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