Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..504i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, May 1984, p. 504-507. Sponsorship: Bundesministerium für Forschung und T
Physics
17
Energetic Particles, Magnetospheric Ion Density, Oxygen Ions, Plasmasphere, Space Plasmas, International Sun Earth Explorer 1, International Sun Earth Explorer 3, Temporal Distribution
Scientific paper
The first measurements of very energetic (112 - 157 keV) O(+) ions in the earth's magnetosphere are presented. The observations were made with the UMd/MPE ULECA sensor on ISEE-1 on 5 March 1981 at geocentric distances approximately 20 R(E) in the earth's magnetotail. During this time period an Energetic Storm Particle event was observed by the nearly identical sensor on the ISEE-3 spacecraft, located approximately 250 R(E) upstream of the earth's magnetosphere. The ISEE-1 sensor observed a similar temporal profile except for several sharp intensity enhancements, corresponding to substorm recoveries during which the plasma sheet engulfed the spacecraft. During these plasma sheet encounters we observe O(+)/H(+) abundance ratios, at approximately 130 kev, as large as 0.35. In between plasma sheet encounters the O(+)/H(+) ratio at this energy is consistent with zero.
Galvin Antoinette B.
Gloeckler George
Hovestadt Dieter
Ipavich Fred M.
Klecker Berndt
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