Exploring the occurrence rate of PMSE-Es by Digisonde at Tromsø  

作　　者：HaiLong Li ShuCan Ge Lin Meng MaoYan Wang Abdur Rauf Safi Ullah 

机构地区：[1]School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China [2]National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China [3]School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Earth and Planetary Physics》2021年第2期187-195,共9页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61671116,61771096,11905026);National Key Research and Development Program of China(No.2019YFA 0210202);Fundamental Research Funds for the Central Universities(No.ZYGX2019Z006,ZYGX2019J012).

摘　　要：Polar mesosphere summer echoes(PMSE)are observed simultaneously with Digisonde and EISCAT VHF radar.The phenomenon of irregular Es layers is called PMSE-like or PMSE-Es(Polar Mesosphere Summer Echoes-Es)and has some relationship with real PMSE.In this paper,the characteristics of irregular Es layers at 80–100 km were observed by Digisonde at Tromsøduring 2003–2014 are statistically analyzed with ionograms.The diurnal,day-to-day and year-to-year variations and discrepancies of occurrence rate between PMSE and PMSE-Es are compared with the statistical results observed by Esrange MST radar(ESRAD),and the reasons are discussed.The results show that the trends in the occurrence rate of PMSE-Es are similar to the trends in the occurrence rate of PMSE,but there are some notable differences.The occurrence rate of PMSE-Es is much lower than the occurrence rate of PMSE.The minimum value of PMSE-Es appears 1–2 hours earlier than the minimum value of the PMSE occurrence rate,while PMSE-Es appear earlier than PMSE in the year.In addition,there is a significant positive correlation between the annual average occurrence rates of PMSE and PMSE-Es.PMSEEs is a relatively important occurrence in the polar mesopause.Analysis of its characteristics can provide new ideas and methods for studying the formation mechanism of PMSE.

关 键 词：Polar mesosphere summer echoes DIGISONDE EISCAT VHF radar PMSE-Es Esrange MST radar 

分 类 号：P35[天文地球—空间物理学]