{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T03:00:17Z","timestamp":1760151617823,"version":"build-2065373602"},"reference-count":63,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T00:00:00Z","timestamp":1648771200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42030201","42104170","41904154","42105120"],"award-info":[{"award-number":["42030201","42104170","41904154","42105120"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002367","name":"Chinese Academy of Sciences","doi-asserted-by":"publisher","award":["XDB41000000","IGGCAS-201904"],"award-info":[{"award-number":["XDB41000000","IGGCAS-201904"]}],"id":[{"id":"10.13039\/501100002367","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100017120","name":"China National Space Administration","doi-asserted-by":"publisher","award":["D020105"],"award-info":[{"award-number":["D020105"]}],"id":[{"id":"10.13039\/100017120","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>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\u2013model comparisons show good agreement near and above the emission peak at around 120 km with an intensity of 27\u201345 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\u2013model 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.<\/jats:p>","DOI":"10.3390\/rs14071705","type":"journal-article","created":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T21:23:55Z","timestamp":1648848235000},"page":"1705","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Modeling the CO2+ Ultraviolet Doublet Emission from Mars with a Multi-Instrument MAVEN Data Set"],"prefix":"10.3390","volume":"14","author":[{"given":"Zichuan","family":"Li","sequence":"first","affiliation":[{"name":"National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China"},{"name":"School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7385-1899","authenticated-orcid":false,"given":"Dandan","family":"Niu","sequence":"additional","affiliation":[{"name":"Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9831-0618","authenticated-orcid":false,"given":"Hao","family":"Gu","sequence":"additional","affiliation":[{"name":"Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China"}]},{"given":"Xiaoshu","family":"Wu","sequence":"additional","affiliation":[{"name":"Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China"},{"name":"Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026, China"}]},{"given":"Yingying","family":"Huang","sequence":"additional","affiliation":[{"name":"National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5130-8185","authenticated-orcid":false,"given":"Jiahao","family":"Zhong","sequence":"additional","affiliation":[{"name":"Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4721-8184","authenticated-orcid":false,"given":"Jun","family":"Cui","sequence":"additional","affiliation":[{"name":"Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China"},{"name":"Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,4,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1004","DOI":"10.1126\/science.165.3897.1004","article-title":"Marine 6: Ultraviolet Spectrum of Mars Upper Atmosphere","volume":"165","author":"Barth","year":"1969","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2213","DOI":"10.1029\/JA076i010p02213","article-title":"Mariner 6 and 7 Ultraviolet Spectrometer Experiment: Upper atmosphere data","volume":"76","author":"Barth","year":"1971","journal-title":"J. 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