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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Initial measurements of O-ion and He-ion decay rates observed fromthe Van Allen probes RBSPICE instrument
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Initial measurements of O-ion and He-ion decay rates observed fromthe Van Allen probes RBSPICE instrument

机译：从Van Allen探针RBSPICE仪器观察到的O离子和He离子衰减率的初始测量

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摘要

H-ion (～45 keV to ～600 keV), He-ion (～65 keV to ～520 keV), and O-ion (～140 keV to ～1130 keV) integral flux measurements, from the Radiation Belt Storm Probe Ion Composition Experiment(RBSPICE) instrument aboard the Van Allan Probes spacecraft B, are reported. These abundance data form a cohesive picture of ring current ions during the first 9 months of measurements. Furthermore, the data presented herein are used to show injection characteristics via the He-ion/H-ion abundance ratio and the O-ion/H-ion abundance ratio. Of unique interest to ring current dynamics are the spatial-temporal decay characteristics of the two injected populations. We observe that He-ions decay more quickly at lower L shells, on the order of ～0.8 day at L shells of 3–4, and decay more slowly with higher L shell, on the order of ～1.7 days at L shells of 5–6. Conversely, O-ions decay very rapidly (～1.5 h) across all L shells. The He-ion decay time are consistent with previously measured and calculated lifetimes associated with charge exchange. The O-ion decay time is much faster than predicted and is attributed to the inclusion of higher-energy (> 500 keV) O-ions in our decay rate estimation. We note that these measurements demonstrate a compelling need for calculation of high-energy O-ion loss rates, which have not been adequately studied in the literature to date.
机译：通过辐射带风暴探针离子测量H离子（〜45 keV至〜600 keV），He离子（〜65 keV至〜520 keV）和O离子（〜140 keV至〜1130 keV）积分通量。报道了Van Allan Probes航天器B上的成分实验（RBSPICE）仪器。这些丰度数据在测量的前9个月中形成了环流离子的内聚图像。此外，本文提供的数据用于通过He离子/ H离子丰度比和O离子/ H离子丰度比显示注入特性。环流动力学的独特兴趣是两个注入种群的时空衰减特征。我们观察到，He离子在较低的L壳层处衰减更快，在3–4个L壳层处约为〜0.8天，而在较高L壳层处衰减则较慢，在5个L壳层处约为1.7天。 –6。相反，O离子在所有L壳层中的衰减非常快（约1.5 h）。氦离子的衰减时间与先前测量和计算的与电荷交换相关的寿命一致。 O离子的衰减时间比预计的要快得多，这归因于我们在衰减率估算中包含了更高能量（> 500 keV）的O离子。我们注意到，这些测量表明迫切需要计算高能O离子损失率，迄今为止，在文献中尚未对此进行充分研究。

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