极隙区一次长时间ELDI事件的观测研究  

Case study of a long-lasting E-layer dominated ionosphere event

作　　者：谷骏 蔡红涛[1] 胡坤[1] 潘建宏 高顺祖 张宏 GU Jun;CAI HongTao;HU Kun;PAN JianHong;GAO ShunZu;ZHANG Hong(Electric Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,武汉430072

出　　处：《地球物理学报》2022年第12期4583-4592,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(42074185)资助.

摘　　要：E层占优电离层(ELDI)是一种特殊的电离层垂直结构,表现出与偶发Es明显不同的时空分布和形态特征,但其形成机理尚不清楚.本文报道了发生在2001年7月15日的一次长持续时间(~2.3 h)的ELDI事件.地面雷达观测表明,该ELDI事件可以按照电子密度剖面不同的变化特征分为两个阶段.在第1个阶段里,E层密度大幅度增强而F层密度未有明显变化;在第2个阶段里,E层密度回落至正常水平而F层密度强烈耗空.卫星及其他地面设备的协同观测数据表明,高能离子沉降是ELDI第1阶段的主导形成机制,而强等离子体对流是第2阶段的主导机制.The E-layer dominated ionosphere(ELDI)is a special ionospheric vertical structure with quite different temporal and spatial distributions and morphological characteristics from the sporadic E layer(Es).However,its formation mechanism has not been well explained.This paper reports an ELDI event with long duration of~2.3 h on July 15,2001.The ELDI event can be divided into two stages according to the electron density profiles shown by the ground-based radar observation.In the first stage,the electron density of E layer showed great increase while the electron density of F layer remained unchanged.In the second stage,the electron density of E layer felt back to normal level,while the electron density of F layer showed great depletion.Based on the coordinated satellite and other ground-based observations,we conclude that for this ELDI event,energetic ion precipitation is the dominant mechanism in the first stage,and strong plasma convection is the dominant mechanism in the second stage.

关 键 词：E层占优电离层 离子沉降 F层耗空 等离子体对流 

分 类 号：P352[天文地球—空间物理学]