Extreme value theory applied to the auroral electrojet indices

作     者：Si Chen Hong Yuan Yong Wei Guang Yang FengZheng Yu Si Chen;Hong Yuan;Yong Wei;Guang Yang;FengZheng Yu

作者机构：Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Key Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Earth and Planetary Physics》 (地球与行星物理（英文版）)

年 卷 期：2024年第8卷第2期

页      面：375-381页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 0706[理学-大气科学] 

基　　金：World Data Center for Geomagnetism 

主　　题：auroral electrojet indices extreme value theory extreme events 

摘      要：The study of extreme weather and space events has gained paramount importance in modern society owing to rapid advances in high technology.Understanding and describing exceptional occurrences plays a crucial role in making decisive assessments of their potential impact on technical,economic,and social aspects in various fields.This research focuses on analyzing the hourly values of the auroral electrojet(AE)geomagnetic index from 1957 to 2019 by using the peak over threshold method in extreme value theory.By fitting the generalized Pareto distribution to extreme AE values,shape parameter indices were derived,revealing negative values that establish an upper bound for this time series.Consequently,it became evident that the AE values had reached a plateau,suggesting that extreme events exceeding the established upper limit are rare.As a result,although the need for diligent precautions to mitigate the consequences of such extreme events persists,surpassing the upper limit of AE values becomes increasingly challenging.It is also possible to observe an aurora in the middle-and low-latitude regions during the maximum period of the AE index.