Atomic oxygen ions as ionospheric biomarkers on exoplanets
Atomic oxygen ions as ionospheric biomarkers on exoplanets
复制标题
原子氧离子作为系外行星电离层生物标志物
DOI:
10.1038/s41550-017-0375-y
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发表时间:
2018
期刊:
影响因子:
14.1
通讯作者:
Dalba, Paul A.
中科院分区:
文献类型:
--
作者:
Mendillo, Michael;Withers, Paul;Dalba, Paul A.
The ionized form of atomic oxygen (O+) is the dominant ion species at the altitude of maximum electron density in only one of the many ionospheres in our Solar System — Earth’s. This ionospheric composition would not be present if oxygenic photosynthesis was not an ongoing mechanism that continuously impacts the terrestrial atmosphere. We propose that dominance of ionospheric composition by O+ions at the altitude of maximum electron density can be used to identify a planet in orbit around a solar-type star where global-scale biological activity is present. There is no absolute numerical value required for this suggestion of an atmospheric plasma biomarker — only the dominating presence of O+ions at the altitude of peak electron density.
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