Solar control of CO&lt;sub&gt;2&lt;/sub&gt; &lt;sup&gt;+&lt;/sup&gt; ultraviolet doublet emission on Mars

Li, ZiChuan; Cui, Jun; Li, Jing; Wu, Xiaoshu; Zhong, Jiahao; Jiang, Fayu

doi:10.26464/epp2020064

Earth and Planetary Physics

2020

DOI: 10.26464/epp2020064

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Solar control of CO<sub>2</sub> <sup>+</sup> ultraviolet doublet emission on Mars

ZiChuan Li

Jun Cui

Jing Li

et al.

Abstract: The brightness profiles of CO 2 + UVD emission on Mars were obtained from the MAVEN IUVS limb observations q Strong solar cycle and solar zenith angle variations in peak emission intensity and altitude were revealed by the data q An extra driver, presumably related to the complicated variation in the background atmosphere, is required to fully interpret the observations q

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Modeling the CO2+ Ultraviolet Doublet Emission from Mars with a Multi-Instrument MAVEN Data Set

Niu

et al. 2022

Remote Sensing

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With the aid of a multi-instrument data set gathered by the Mars Atmosphere and Volatile Evolution (MAVEN) during ten selected periods, we make detailed calculations of the CO2+ Ultraviolet Doublet (UVD) emission brightness profiles which are then compared to the Imaging Ultraviolet Spectrometer limb observations. Our calculations confirm that the photoionization of atmospheric CO2 is the predominant process driving CO2+ UVD emission at high altitudes, whereas the photoelectron impact ionization of CO2 becomes more important at low altitudes. The data–model comparisons show good agreement near and above the emission peak at around 120 km with an intensity of 27–45 kR. A special case is found for period 3 coincident with a regional dust storm during which the peak altitude rose by 20 km. Of particular interest is the significant discrepancy below the peak, which is likely associated with the uncertainties in either atmospheric density or incident solar irradiance. A detailed investigation suggests that the latter uncertainty is more likely responsible for such a discrepancy, in that the solar irradiance shortward of a wavelength threshold below 30 nm should be adjusted to achieve reasonable data–model agreement over the entire altitude range. This result highlights the necessity to improve the accuracy of any solar irradiance model used for planetary aeronomical studies.

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Modeling the CO2+ Ultraviolet Doublet Emission from Mars with a Multi-Instrument MAVEN Data Set

Niu

et al. 2022

Remote Sensing

View full text Add to dashboard Cite

show abstract

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Solar control of CO<sub>2</sub> <sup>+</sup> ultraviolet doublet emission on Mars

Cited by 1 publication

References 35 publications

Modeling the CO2+ Ultraviolet Doublet Emission from Mars with a Multi-Instrument MAVEN Data Set

Modeling the CO2+ Ultraviolet Doublet Emission from Mars with a Multi-Instrument MAVEN Data Set

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