期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 121, 期 2, 页码 1091-1113出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JA021765
关键词
magnetosphere; solar wind penetration; Polar; oxygen charge states; ionospheric outflow; plasma convection
资金
- SO-HIS by NASA/GSFC [NNG10EK25C]
- Two Wide-angle Imaging Neutral-atom Spectrometers mission as a part of NASA's Explorer Program
- Magnetospheric Multiscale mission
Geomagnetically trapped oxygen ions of solar and ionospheric origin have previously been observed in the Earth's magnetosphere. Early observations from Active Magnetospheric Particle Tracer Explorers/CCE have studied this distribution within a limited spatial range of L shells over all magnetic local times (MLT). This study expands on these early results using observations from the Polar spacecraft. The distributions by charge state show O6+, from the solar wind, charge exchanging into O5+, O4+, and O3+ as the ion populations drift to lower L shells. Meanwhile, ionospheric O+ and O2+ are primarily seen at low L shells and may also play a role in O3+ populations. We also present here the Dst, VswBz, and AE dependencies of oxygen charge states (O+ through O6+) in MLT and L shell in the magnetosphere of the Earth. The distributions of these charge states provide insight into the injection and energization of both ionospheric oxygen as well as solar wind ions inside the magnetosphere. Key Points
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