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DOI | 10.1038/NGEO2958 |
Detection of a persistent meteoric metal layer in the Martian atmosphere | |
Crismani, M. M. J.1; Schneider, N. M.1; Plane, J. M. C.2; Evans, J. S.3; Jain, S. K.1; Chaffin, M. S.1; Carrillo-Sanchez, J. D.2; Deighan, J. I.1; Yelle, R. V.4; Stewart, A. I. F.1; McClintock, W.1; Clarke, J.5; Holsclaw, G. M.1; Stiepen, A.6; Montmessin, F.7; Jakosky, B. M.1 | |
2017-06-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; Belgium; France |
英文摘要 | Interplanetary dust particles sporadically enter planetary atmospheres at orbital velocities and ablate as collisions occur with ambient gases to produce a persistent layer of metallic atoms (for example, Fe, Mg, Na) in their upper atmospheres. Such layers are well studied at Earth, but have not been directly detected elsewhere in the Solar System. Here we report the detection of a meteoric layer consisting of Mg+ ions near an altitude of 90 km in the Martian atmosphere from ultraviolet remote sensing observations by NASA's MAVEN spacecraft. We observe temporal variability in the Mg+ layer over the course of a Martian year, moving up and down in altitude seasonally and in response to dust storms, and displaying diurnal fluctuations in density. We also find that most meteor showers do not significantly perturb this layer, which constrains the fluence of eleven observed Martian meteor showers to less than our estimated global dust flux. The persistence and variability of the Mg+ layer are difficult to explain with existing models and reconcile with other transient layers of ions observed in the Martian ionosphere. We suggest that the transient layers are not sourced from the persistent Mg+ layer and thus not derived from meteoric material, but are ambient ions produced by some unknown mechanism. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402579200006 |
WOS关键词 | MAGNESIUM ; MODEL ; IONS ; CHEMISTRY ; ORIGIN |
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/34902 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Colorado, LASP, Boulder, CO 80303 USA; 2.Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England; 3.Computat Phys Inc, Springfield, VA 22151 USA; 4.Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA; 5.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 6.Univ Liege, Lab Phys Atmospher & Planetaire, Space Sci Technol & Astrophys Res STAR, B-4000 Liege, Belgium; 7.LATMOS IPSL, F-78280 Guyancourt, France |
推荐引用方式 GB/T 7714 | Crismani, M. M. J.,Schneider, N. M.,Plane, J. M. C.,et al. Detection of a persistent meteoric metal layer in the Martian atmosphere[J]. NATURE GEOSCIENCE,2017,10(6). |
APA | Crismani, M. M. J..,Schneider, N. M..,Plane, J. M. C..,Evans, J. S..,Jain, S. K..,...&Jakosky, B. M..(2017).Detection of a persistent meteoric metal layer in the Martian atmosphere.NATURE GEOSCIENCE,10(6). |
MLA | Crismani, M. M. J.,et al."Detection of a persistent meteoric metal layer in the Martian atmosphere".NATURE GEOSCIENCE 10.6(2017). |
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