Discovery of He 2+  and O 2+  ions of terrestrial origin in the outer magnetosphere | Zendy

Young D. T. | Zendy; Geiss J. | Zendy; Balsiger H. | Zendy; Eberhardt P. | Zendy; Ghielmetti A. | Zendy; Rosenbauer H. | Zendy

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Discovery of He 2+ and O 2+ ions of terrestrial origin in the outer magnetosphere

Author(s) -

Young D. T.,

Geiss J.,

Balsiger H.,

Eberhardt P.,

Ghielmetti A.,

Rosenbauer H.

Publication year - 1977

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl004i012p00561

Subject(s) - magnetosphere , ion , physics , earth radius , van allen radiation belt , range (aeronautics) , nuclear physics , materials science , plasma , quantum mechanics , composite material

Using the Ion Composition Experiment (ICE) on board ESA'S GEOS satellite we have observed He 2+ and O 2+ 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 O 2+ /O + ∼ 30% and He 2+ /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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