| 基于卡方分布函数的辐射带电子蝴蝶状投掷角分布的优化判别方法 |
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| 引用本文： | 罗琼,倪彬彬,曹兴,顾旭东,易娟,郭英杰,郭德宇,周若贤,龙敏义.基于卡方分布函数的辐射带电子蝴蝶状投掷角分布的优化判别方法[J].地球物理学报,2022,65(3):809-818. |
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| 作者姓名： | 罗琼 倪彬彬 曹兴 顾旭东 易娟 郭英杰 郭德宇 周若贤 龙敏义 |
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| 作者单位： | 武汉大学电子信息学院空间物理系,武汉430072,武汉大学电子信息学院空间物理系,武汉430072;中国科学院比较行星学卓越创新中心,合肥230026 |
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| 基金项目： | 国家自然科学基金(42025404,42188101,41904144,41704162);中国科学院先导B项目(XDB41000000);民用航天预研项目(D020308,D020104,D020303)共同资助。 |
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| 摘 要： | 受不同物理过程影响,辐射带电子呈现多种投掷角分布类型,其中蝴蝶状分布尤为引人关注,其特征为通量在90°投掷角附近有极小值、在较低投掷角处达到峰值.现有研究普遍通过对几个特定投掷角间的通量比值进行限定来识别蝴蝶状分布,然而,该方法所挑选的电子分布并不一定符合蝴蝶状分布特征,这为准确研究电子蝴蝶状分布的现象学规律及其背后物...
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| 关 键 词： | 辐射带 电子蝴蝶状投掷角分布 卡方分布函数 优化判别 |
An optimized identification method for radiation belt electron butterfly pitch angle distributions based on the chi-square distribution function |
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| LUO Qiong,NI BinBin,CAO Xing,GU XuDong,YI Juan,GUO YingJie,GUO DeYu,ZHOU RuoXian,LONG MinYi.An optimized identification method for radiation belt electron butterfly pitch angle distributions based on the chi-square distribution function[J].Chinese Journal of Geophysics,2022,65(3):809-818. |
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| Authors: | LUO Qiong NI BinBin CAO Xing GU XuDong YI Juan GUO YingJie GUO DeYu ZHOU RuoXian LONG MinYi |
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| Institution: | (Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072,China;Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,China) |
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| Abstract: | Due to different physical mechanisms,radiation belt electrons exhibit types of pitch angle distribution.Recently,the characterful butterfly pitch angle distribution has received extensive attentions with the flux minimum around 90°pitch angles and the flux peak at lower pitch angles.To identify the butterfly pitch angle distributions,previous studies usually set the threshold for the electron flux ratio between several specific pitch angles.However,such criterion will bring some uncertainties to distinguish butterfly-distribution profile.Therefore,it was difficult to accurately investigate the phenomenological law and physical mechanisms of the butterfly distribution.In this study,we develop an identification method based on the chi-square distribution function to identify butterfly distribution,by comparing the similarity between the observed flux profile and the ideal butterfly distribution profiles simulated by the model.Using two sets of electron flux data with different pitch-angle resolutions measured by Van Allen Probes REPT instrument at L-shell>3,we find that our method can significantly improve the identification on butterfly distributions.By using two flux datasets with 17 pitch angles and 36 pitch angles,our method can reduce the false identification rates by 12.6%and 27.5%,respectively.Our results demonstrate that increasing the pitch-angle resolutions is effective to accurately identify the radiation belt electron distributions.Moreover,the developed method is of great importance for further statistical research on electron butterfly distribution in the Earth and planetary magnetospheres. |
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| Keywords: | Radiation belt Electron butterfly pitch angle distribution Chi-square distribution function Optimized identification |
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