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

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

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977georl...4..561y&link_type=abstract

Geophysical Research Letters, vol. 4, Dec. 1977, p. 561-564. Research supported by the Max-Planck Society; Swiss National Scien

Physics

22

Earth Magnetosphere, Geos Satellites (Esa), Helium Ions, Oxygen Ions, Plasma Composition, Satellite Observation, Abundance, Hydrogen Ions, Magnetic Effects, Plasma Diagnostics

Scientific paper

Using the Ion Composition Experiment (ICE) onboard ESA's GEOS satellite He(2+) and O(2+) ions of terrestrial origin in the outer magnetosphere predominantly in the energy range of about 1-100 eV are observed. 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(+) of about 30% and He(2+)/He(+) of about 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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