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Characterizing the Earth's outer Van Allen zone using a radiation belt content index

机译：使用辐射带含量指数表征地球的外部范艾伦区

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摘要

We have utilized knowledge acquired from near-Earth spacecraft missions to construct a “radiation belt content” (RBC) index. This index sums radiation belt electron fluxes above several chosen threshold energies (most commonly, E > 2 MeV) and over the range of magnetic L shells 2.5 ≤ L ≤ 6.5. The method takes account of pitch angle distribution effects and magnetic flux tube properties. As constructed, the RBC index gives a simple, robust, and readily utilized daily estimate of the total number of electrons throughout the entire outer Van Allen radiation belt. We show correlative comparisons with concurrent solar wind parameters, geomagnetic indices, and geostationary orbit (GOES) data sets. We also examine statistical and recurrence characteristics of the RBC index itself. Results are compared with some of the orbit-integrated dose results from the Highly Elliptical Orbit (HEO) satellite 1997-068 that covers the same L range. The correlation of the RBC index with various spacecraft data clearly illustrates the remarkable coherence of the outer Van Allen radiation belt previously described, for example, by Kanekal et al. [2001]. Although the RBC index may be viewed as suppressing much of the spatial information content of the direct electron measurements in the outer trapping zone, it nonetheless gives a useful tool for statistical and time series analysis. The utilization of such a long-term, homogeneous index for space weather purposes is suggested.
机译：我们利用从近地航天器飞行任务中获得的知识来构建“辐射带含量”（RBC）指数。该指数将辐射带电子通量的总和提高到几个选定的阈值能量以上（最常见的是，E> 2 MeV），并且在磁性L壳的范围内2.5≤L≤6.5。该方法考虑了俯仰角分布效应和磁通管特性。如构造的那样，RBC指数给出了整个整个Van Allen辐射带中电子总数的简单，可靠且易于使用的每日估计。我们显示了与并发太阳风参数，地磁指数和对地静止轨道（GOES）数据集的相关比较。我们还检查了RBC索引本身的统计和复发特征。将结果与覆盖相同L范围的高椭圆轨道（HEO）卫星1997-068的一些轨道积分剂量结果进行了比较。 RBC指数与各种航天器数据的相关性清楚地说明了先前由例如Kanekal等人描述的Van Van Allen辐射带的显着一致性。 [2001]。尽管RBC指数可被视为抑制了外部俘获区中直接电子测量的许多空间信息内容，但它仍提供了用于统计和时间序列分析的有用工具。建议将这种长期的均匀指数用于太空天气。

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