Short-term variability of inner-source pickup ions at 1 AU - SOHO/CELIAS observations

Short-term variability of inner-source pickup ions at 1 AU - SOHO/CELIAS observations
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1 AU 内源拾取离子的短期变化 - SOHO/CELIAS 观测

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发表时间：
2015
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通讯作者：
R. Wimmer–Schweingruber
R. Wimmer–Schweingruber
中科院分区：
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文献类型：
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作者：
L. Berger;C. Drews;A. Taut;R. Wimmer–Schweingruber

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上下文。1995年，在内日光层中发现了第二个扩展的拾取离子源。从那时起，这一所谓的内在来源在许多研究中被描述为特征，并对其性质提出了不同的假设。但直到今天，内在源头的详细性质仍然不为人知。目标。尽管太阳风和尘埃的相互作用似乎最有可能在内源吸收离子的产生中发挥关键作用，但现有的观测尚未为任何拟议的情景提供确凿证据。通过分析内源的短期变化，我们确定了一个新的观测约束来解决内源的性质。方法：研究方法。我们利用1996年在fl第一拉格朗日点的太阳和日球层天文台上运行的Charge Time-of-fiIGT仪器的数据集，分析了内源O+和C+。每电荷质量分辨率的无与伦比的组合，足以完全分解O+和C+，以及典型的每天约150次计数的高计数率，使我们第一次能够解决内部源的短期变化性问题。结果。内源和太阳风离子的变率比较表明，内源拾取的氧和碳的flUX分别与太阳风氧和碳的flUX直接相关。结论。在仅考虑内部源性质的各种情景中，太阳风中和的情景符合这一新的观测约束。
Context. In 1995 a second extended source of pickup ions in the inner heliosphere was discovered. Since then this so-called inner source has been characterised in many studies, and various scenarios for its nature have been proposed. But to this day, the detailed nature of the inner source is still unknown. Aims. Although it seems most likely that an interaction of solar wind and dust plays a key role in the production of the inner source pickup ions, available observations have not provided conclusive evidence for any proposed scenario. By analysing the short-term variability of the inner source, we determine a new observational constraint to address the nature of the inner source. Methods. We used the data set of the charge time-of-flight instrument that operated in 1996 on-board the solar and heliospheric observatory at the first Lagrangian point to analyse inner source O + and C + . The unmatched combination of mass per charge resolution, which is su ffi cient to definitely resolve O + and C + , and typical high count rates of about 150 counts per day allowed us to address the short-term variability of the inner source for the first time. Results. The comparison of the variability of inner-source and solar-wind ions shows that the flux of inner source pickup oxygen and carbon is directly correlated with the flux of solar wind oxygen, and carbon, respectively. Conclusions. Among the scenarios for the nature of the inner source alone, the scenario of solar-wind neutralisation agrees with this new observational constraint.