Energetic (>100 keV) O +  ions in the plasma sheet | Zendy

Ipavich F. M. | Zendy; Galvin A. B. | Zendy; Gloeckler G. | Zendy; Hovestadt D. | Zendy; Klecker B. | Zendy; Scholer M. | Zendy

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Energetic (>100 keV) O + ions in the plasma sheet

Author(s) -

Ipavich F. M.,

Galvin A. B.,

Gloeckler G.,

Hovestadt D.,

Klecker B.,

Scholer M.

Publication year - 1984

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/gl011i005p00504

Subject(s) - substorm , plasma sheet , magnetosphere , physics , ion , plasma , atomic physics , van allen probes , van allen radiation belt , nuclear physics , quantum mechanics

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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