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We present the first measurements of very energetic (112 ‐ 157 keV) O + ions in the earth's magnetosphere. The observations were made with the UMd/MPE ULECA sensor on ISEE‐1 on 5 March 1981 at geocentric distances ∼20 R E in the earth's magnetotail. During this time period an Energetic Storm Particle event was observed by our nearly identical sensor on the ISEE‐3 spacecraft, located ∼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 ∼130 keV, as large as 0.35. In between plasma sheet encounters the O + /H + ratio at this energy is consistent with zero.
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Ipavich et al. (1984) studied this question.
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