This article provides a short review on the importance of the detailed analysis of a Langmuir probe I-V trace in a multi-Maxwellian plasma,and discuss proper procedures analyzing Langmuir probe I-V traces in bi-Maxwel...This article provides a short review on the importance of the detailed analysis of a Langmuir probe I-V trace in a multi-Maxwellian plasma,and discuss proper procedures analyzing Langmuir probe I-V traces in bi-Maxwellian and triple-Maxwellian Electron Energy Distribution Function(EEDF)plasmas.Discus⁃sion and demonstration of procedures include the treatment of the ion saturation current,electron saturation cur⁃rent,space-charge effects on the I-V trace,and most importantly how to properly isolate and fit for each electron group present in an I-V trace reflecting a mult-Maxwellian EEDF,as well as how having a multi-Maxwellian EEDF affects the procedures of treating the ion and electron saturation currents.Shortcomings of common improp⁃er procedures are discussed and demonstrated with simulated I-V traces to show how these procedures gives false measurements.展开更多
开发地球电子辐射带的数据同化模型,对于理解辐射带电子的动态演化过程和辐射带空间天气预报具有重要意义.结合范阿伦卫星的辐射带电子观测数据和外辐射带三维扩散模型,采用卡尔曼滤波算法,本文开发了基于Fortran语言的外辐射带电子三...开发地球电子辐射带的数据同化模型,对于理解辐射带电子的动态演化过程和辐射带空间天气预报具有重要意义.结合范阿伦卫星的辐射带电子观测数据和外辐射带三维扩散模型,采用卡尔曼滤波算法,本文开发了基于Fortran语言的外辐射带电子三维数据同化模型(Three-dimensional Data Assimilative Model of Outer Radiation belt Electrons,简称TDAMORE),实现对L^(*)=3~7、能量范围为0.1~5 MeV、投掷角范围为5°~90°的外辐射带电子时空变化过程的三维重构.通过对2018年8月期间外辐射带电子通量演化过程的重构,证实TDAMORE模型可以较好地重现不同能量和不同投掷角电子通量在磁暴前后的演化特征.通过分析电子通量的观测和同化结果之间的相关系数、平均误差、平均绝对误差和均方误差,发现对于能量低于4 MeV的电子,观测与同化结果之间的相关系数基本大于0.8且误差相对较低.而对于更高能量的电子,观测与同化结果之间的误差相对较高,这可能是同化模型忽略了电磁离子回旋波对电子的散射损失导致的.展开更多
文摘This article provides a short review on the importance of the detailed analysis of a Langmuir probe I-V trace in a multi-Maxwellian plasma,and discuss proper procedures analyzing Langmuir probe I-V traces in bi-Maxwellian and triple-Maxwellian Electron Energy Distribution Function(EEDF)plasmas.Discus⁃sion and demonstration of procedures include the treatment of the ion saturation current,electron saturation cur⁃rent,space-charge effects on the I-V trace,and most importantly how to properly isolate and fit for each electron group present in an I-V trace reflecting a mult-Maxwellian EEDF,as well as how having a multi-Maxwellian EEDF affects the procedures of treating the ion and electron saturation currents.Shortcomings of common improp⁃er procedures are discussed and demonstrated with simulated I-V traces to show how these procedures gives false measurements.
文摘开发地球电子辐射带的数据同化模型,对于理解辐射带电子的动态演化过程和辐射带空间天气预报具有重要意义.结合范阿伦卫星的辐射带电子观测数据和外辐射带三维扩散模型,采用卡尔曼滤波算法,本文开发了基于Fortran语言的外辐射带电子三维数据同化模型(Three-dimensional Data Assimilative Model of Outer Radiation belt Electrons,简称TDAMORE),实现对L^(*)=3~7、能量范围为0.1~5 MeV、投掷角范围为5°~90°的外辐射带电子时空变化过程的三维重构.通过对2018年8月期间外辐射带电子通量演化过程的重构,证实TDAMORE模型可以较好地重现不同能量和不同投掷角电子通量在磁暴前后的演化特征.通过分析电子通量的观测和同化结果之间的相关系数、平均误差、平均绝对误差和均方误差,发现对于能量低于4 MeV的电子,观测与同化结果之间的相关系数基本大于0.8且误差相对较低.而对于更高能量的电子,观测与同化结果之间的误差相对较高,这可能是同化模型忽略了电磁离子回旋波对电子的散射损失导致的.
