论文信息 - Discovery of He2+ and O2+ ions of terrestrial origin in the outer magnetosphere

Discovery of He2+ and O2+ ions of terrestrial origin in the outer magnetosphere

Using the Ion Composition Experiment (ICE) on board ESA'S GEOS satellite we have observed He2+ and O2+ ions of terrestrial origin in the outer magnetosphere predominantly in the energy range ∼ 1 - 100 eV. Data were obtained near the equatorial plane at geocentric distances of 3 to 7 earth radii in the local time sector 1500 - 2100 hours. During periods when doubly charged ions are observed typical abundances are O2+/O+ ∼ 30% and He2+/He+ ∼ 0.5% - 10%. The proportions of the major constituents H+, He+, and O+ are highly variable with He+ occasionally the dominant species at higher altitudes.

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