地球与行星物理论评（中英文）2027，Vol.58Issue(1)：98-105,8.DOI:10.19975/j.dqyxx.2026-016
修正电子声波在准静态平行电场演化中的作用
The role of modified electron acoustic waves in the evolution of quasi-static parallel electric fields
摘要
Abstract
The auroral arc is a common form of aurora.Its formation involves three processes:the transfer of disturbed energy from the source region to the acceleration region via Alfvén waves,the generation of acceleration structures within the acceleration region,and the acceleration of electrons to produce aurora.Observations indicate that the auroral arc corresponds to a quasi-static parallel electric field with a U-shaped structure,with a clear con-centration of the electric field at the bottom of the U-shaped structure.Regarding how the initial energy input evolves into a quasi-static electric field with a U-shaped structure,simulation studies based on existing auroral particle acceleration theories have not yet fully reproduced results that are fully consistent with the observed char-acteristics.This suggests that the existing theory may still lack a description of a key energy conversion process.Our research indicates that the core of this process lies precisely in the modified electron acoustic wave unique to the transition region.Based on this,we have constructed a dynamic theoretical model that incorporates,for the first time,the coupling of modified electron acoustic waves and kinetic Alfvén waves.The model's output is in good agreement with the observed characteristics of the U-shaped structure,directly revealing the decisive role of modi-fied electron acoustic waves in the formation and evolution of the quasi-static electric field.This achievement provides a new physical foundation for improving the theory of auroral particle acceleration.关键词
极光弧/Alfvén波/准静态电场/过渡区/修正电子声波Key words
auroral arc/Alfvén wave/quasi-static parallel electric field/transition region/modified electron acoustic wave分类
天文与地球科学引用本文复制引用
石润,韩德胜..修正电子声波在准静态平行电场演化中的作用[J].地球与行星物理论评（中英文）,2027,58(1):98-105,8.基金项目
国家自然科学基金资助项目(42030101,42474205,41974193,42130210) Supported by the National Natural Science Foundation of China(Grant Nos.42030101,42474205,41974193,42130210) （42030101,42474205,41974193,42130210）
