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DOI | 10.1002/2017GL074562 |
Photochemical determination of O densities in the Martian thermosphere: Effect of a revised rate coefficient | |
Fox, Jane L.1; Johnson, Austin S.1,2; Ard, Shaun G.3; Shuman, Nicholas S.3; Viggiano, Albert A.3 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We investigate the production and loss rates of O-2(+) in the photochemical equilibrium region of the Martian ionosphere near the subsolar point. We adopt neutral and ion densities measured by the Mars Atmosphere and Volatiles EvolutioN (MAVEN) Neutral Gas and Ion Mass Spectrometer (NGIMS), electron densities and temperatures measured by the Langmuir Probe and Waves, and ion temperatures measured by the Supra-Thermal and Thermal Ion Composition instruments on the MAVEN spacecraft. Contrary to the conventional wisdom, we find that loss of O-2(+) by dissociative recombination is balanced mainly by production due to the reaction of O+ with CO2, with a smaller contribution due to the reaction of CO2+ with O. We find that the O densities derived from this calculation are larger than those measured by the NGIMS instrument by a factor that averages about 4 over the range of 130-155km. This general conclusion is supported by a newly measured rate coefficient for the reaction of O with CO2+, which is smaller by a factor of about 6 than the only value in the literature, which was measured 47years ago. |
英文关键词 | ion chemistry
Mars ionosphere
Mars thermosphere
photochemical equilibrium calculations
O abundance on Mars
|
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800001 |
WOS关键词 | INTERNAL ENERGY DEPENDENCES ; DISSOCIATIVE RECOMBINATION ; UPPER-ATMOSPHERE ; KINETIC-ENERGY ; RATE CONSTANTS ; TEMPERATURE ; IONOSPHERE ; MARS ; IONS ; NO |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28783 |
专题 | 气候变化 |
作者单位 | 1.Wright State Univ, Dept Phys, Dayton, OH 45435 USA; 2.Univ Alaska, Inst Geophys, Fairbanks, AK USA; 3.Air Force Res Lab, Space Vehicle Directorate, Albuquerque, NM USA |
推荐引用方式 GB/T 7714 | Fox, Jane L.,Johnson, Austin S.,Ard, Shaun G.,et al. Photochemical determination of O densities in the Martian thermosphere: Effect of a revised rate coefficient[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Fox, Jane L.,Johnson, Austin S.,Ard, Shaun G.,Shuman, Nicholas S.,&Viggiano, Albert A..(2017).Photochemical determination of O densities in the Martian thermosphere: Effect of a revised rate coefficient.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Fox, Jane L.,et al."Photochemical determination of O densities in the Martian thermosphere: Effect of a revised rate coefficient".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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