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Here we report results recorded by the Mass Spectrum Analyzer on board Mio, which reveal the presence of cold O<jats:sup>+<\/jats:sup> and C<jats:sup>+<\/jats:sup> with an average total flux of ~4\u2009\u00b1\u20091\u2009\u00d7\u200910<jats:sup>4<\/jats:sup>\u2009cm<jats:sup>\u22122<\/jats:sup>\u2009s<jats:sup>\u22121<\/jats:sup> at a distance of about six planetary radii in a region that has never been explored before. The ratio of escaping C<jats:sup>+<\/jats:sup> to O<jats:sup>+<\/jats:sup> is at most 0.31\u2009\u00b1\u20090.2, implying that, in addition to atomic O<jats:sup>+<\/jats:sup> ions, CO group ions or water group ions may be a source of the observed O<jats:sup>+<\/jats:sup>. Simultaneous magnetometer observations suggest that these planetary ions were in the magnetosheath flank in the vicinity of the magnetic pileup boundary downstream. These results have important implications regarding the evolution of Venus\u2019s atmosphere and, in particular, the evolution of water on the surface of the planet.<\/jats:p>","DOI":"10.1038\/s41550-024-02247-2","type":"journal-article","created":{"date-parts":[[2024,4,12]],"date-time":"2024-04-12T10:02:06Z","timestamp":1712916126000},"page":"716-724","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus"],"prefix":"10.1038","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8587-0202","authenticated-orcid":false,"given":"L. 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