用Cluster/RAPID/IES仪器测量地球辐射带和环电流中的电子强度
Electron intensity measurements by the Cluster/RAPID/IES instrument in Earths radiation belts and ring current
摘要：
2000年发射的星团飞行任务产生了一个利用自适应粒子成像探测器研究/成像电子光谱仪仪器测量地球磁层电子通量强度的大型数据库。然而，由于辐射带和环电流中高能电子（>400 keV）和内区质子（230-630 keV）的背景污染，这些数据很少用于内磁层科学。本文提出了两种背景校正算法。第一种算法基于质子和电子的经验污染百分比。第二种算法使用同步质子观测。这些算法的效率通过比较校正的Cluster/RAPID/IES数据与2012-2015年的Van Allen Probes/Magnetic Electron Ion Spectrometer（MagEIS）测量值来证明。这两种技术都改善了IES在辐射带和环电流中的电子数据。IES校正的测量结果还与2017年两个会合期间的Arase中能粒子实验-电子分析仪（MEP-e）电子数据进行了比较，也显示出接近1的比率。我们展示了一个科学的应用程序的校正IES电子数据分析其演变过程中的太阳活动周期。2001- 2016年期间，外层带能量为40-400 keV的自旋平均年平均IES电子强度在4和6之间与AE指数和太阳风动压呈高度正相关。导出了外辐射带太阳风动压与IES电子测量值之间的线性-对数关系。
英文摘要：
The Cluster mission, launched in 2000, has produced a large database of electron flux intensity measurements in the Earths magnetosphere by the Research with Adaptive Particle Imaging Detector (RAPID)/ Imaging Electron Spectrometer (IES) instrument. However, due to background contamination of the data with high-energy electrons (>400 keV) and inner- zone protons (230-630 keV) in the radiation belts and ring current, the data have been rarely used for inner-magnetospheric science. The current paper presents two algorithms for background correction. The first algorithm is based on the empirical contamination percentages by both protons and electrons. The second algorithm uses simultaneous proton observations. The efficiencies of these algorithms are demonstrated by comparison of the corrected Cluster/RAPID/IES data with Van Allen Probes/Magnetic Electron Ion Spectrometer (MagEIS) measurements for 2012-2015. Both techniques improved the IES electron data in the radiation belts and ring current.Yearly averaged flux intensities of the two missions show the ratio of measurements close to 1. IES corrected measurements were also compared with Arase Medium-Energy Particle Experiments-Electron Analyzer (MEP-e) electron data during two conjunction periods in 2017 and also exhibited ratio close to 1. We demonstrate a scientific application of the corrected IES electron data analyzing its evolution during solar cycle. Spin-averaged yearly mean IES electron intensities in the outer belt for energies 40-400 keV at L-shell between 4 and 6 showed high positive correlation with AE index and solar wind dynamic pressure during 2001- 2016. Relationship between solar wind dynamic pressure and IES electron measurements in the outer radiation belt was derived as a uniform linear-logarithmic equation.
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