远东地区的微粒E层事件  

THE EVENTS OF THE PARTICLE E IN THE FAR EAST

作　　者：何友文[1] 顾厚东 

机构地区：[1]中国电波传播研究所

出　　处：《空间科学学报》1990年第1期42-49,共8页Chinese Journal of Space Science

摘　　要：本文给出了1983—1985年磁暴期间,我国乌鲁木齐等七个站及日本国分寺等五个站出现微粒E层的情况;得到了微粒E层的日变化、月变化和纬度变化;结合同时的地磁、宇宙线、TEC和电离层的变化,对微粒E层出现率作了分析.初步证实:微粒E层的形成和维持与赤道环电流指数(D_(st))负变幅大小密切相关,此外还同宇宙线的FD(Forbush decreases)事件的出现有关.作者认为,沉降粒子可能是低纬地区微粒E层事件的主要粒子来源.In this paper, using ionosonde data in Urumqi, Lanzhou, Beijing, Changchun, Manzhouli, Chongqing and Hainan of China and Wakkanai, Akita, Kokubunji, Yamagawa and Okinawa of Japan and simultaneously observed data of the geomagnetism, cosmic rays, TEC and ionosphere during the magnetic storm in 1983-1985, various variation of the occurrence rate of the particle E are presented. These variations obviously are shown that:(1) The events of the particle E occur mainly during the main phase and expansive phase of the magnetic storm. The occurrence rate of the particle E has a close correlation with the magnetude of the decreasing of the equatorial ring current index (Dst-index), but is not connected with the magnetic storm's type (sudden-commencement or gradual-commencement).(2) The monthly variation of the occurrence rate of the particle E is the most in the spring, little in the summer.(3) The diurnal variation of the occurrence rate of the particle E is more at midnight than at earlier midnight.(4) TEC always sharply increases during the events of the particle E.(5) The maximum occurrence rate of the particle E is above 30 degrees of the geomagnetic latitude in China, above 25 degrees of the geomagnetic latitude in Japan.In addition, it i5 supposed that the precipitation particle may be the main cause for theevents of the particle E in the low-latitude region.

关 键 词：微粒 E层 磁暴 沉降粒子 

分 类 号：P318.22[天文地球—固体地球物理学]