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2017
Authors: Cohen Ian J., Mitchell Donald G., Kistler Lynn M., Mauk Barry H., Anderson Brian J., et al.
Title: Dominance of high energy (>150 keV) heavy ion intensities in Earth's middle to outer magnetosphere
Abstract: Previous observations have driven the prevailing assumption in the field that energetic ions measured by an instrument using a bare solid state detector (SSD) are predominantly protons. However, new near-equatorial energetic particle observations obtained between 7 and 12 RE during Phase 1 of the Magnetospheric Multiscale (MMS) mission challenge the validity of this assumption. In particular, measurements by the Energetic Ion Spectrometer (EIS) instruments have revealed that the intensities of heavy ion species (specifically oxygen and helium) dominate those of protons at energies math formula150-220 keV in the middle to outer (>7 RE) magnetosphere. Given that relative composition measurements can drift as sensors degrade in gain, quality cross-calibration agreement between EIS observation. . .
Date: 08/2017 Publisher: Journal of Geophysical Research: Space Physics DOI: 10.1002/2017JA024351 Available at: onlinelibrary.wiley.com/doi/10.1002/2017JA024351/full
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