极地研究2024，Vol.36Issue(1)：70-79,10.DOI:10.13679/j.jdyj.20240009
极盖区等离子体云块触发的极向边界点亮事件的观测研究
Observation of poleward boundary intensification events triggered by polar cap patches
摘要
Abstract
Polar cap patches are common high-density irregularities in the polar cap ionosphere with electron den-sities of more than twice the background density.Poleward boundary intensifications(PBI)are auroral structures characterized by significantly enhanced brightness of the nightside auroral oval at its poleward boundary.Understanding PBI formation,evolution,and relationship with polar cap plasma is crucial to study the process of polar ionosphere-magnetosphere coupling.In this work,we analyzed the complete PBI gen-eration process triggered by polar cap patches moving to the poleward boundary of the nightside auroral oval,using observational data from the all-sky auroral imager of the Arctic Yellow River Station,the European Incoherent Scatter(EISCAT)radars,and total electron content data from the GPS receivers.The results in-dicate that high-density plasma moved antisunward and reached the nightside poleward boundary of the auroral oval,markedly enhancing the local auroral intensity and triggering PBI events.When substorms in-duced a poleward expansion of the nightside auroral oval,EISCAT Svalbard 42 m radars observed high-density plasma structures with high electron and ion temperatures,as well as a decrease of the electron den-sity peak height and an ion upflow,both explained by high-density plasma vertical transport and particle precipitation.This implies that plasma transported from the polar cap region to the nightside auroral oval effectively triggered PBI events that in turn,influenced the plasma characteristics.This analysis clarifies ionosphere-magnetosphere coupling processes in the nightside polar region.关键词
极盖区等离子体云块/极向边界点亮/极光亚暴/电离层对流/北极Key words
polar cap patches/poleward boundary intensification/auroral substorms/ionospheric convec-tion/Arctic引用本文复制引用
赵变龙,张端,邢赞扬,张清和,马羽璋,王勇,胡泽骏,张佼佼,王翔宇,陆盛..极盖区等离子体云块触发的极向边界点亮事件的观测研究[J].极地研究,2024,36(1):70-79,10.基金项目
国家自然科学基金(42120104003,42204164)、山东省自然科学基金(ZR2022MD034,ZR2022QD077)、小米青年学者项目、电波环境特性及模化技术国家重点实验室基金(6142403180204)、中国电波传播研究所稳定支持科研经费资助项目(A132312191)和国家博士后科学基金(2021M701974)资助 （42120104003,42204164）
