一次中强磁暴期间低纬电离层响应的CT成像  

LOW-LATITUDINAL IONOSPHERIC EFFECTS DURING A MODERATE STORM BY TOMOGAPHIC IMAGING

作　　者：徐继生[1] 马淑英[1] 吴雄斌[1] 林根煌 叶公节 

机构地区：[1]武汉大学电子信息学院,武汉430072 [2]台湾中山大学电子工程系 [3]Dept of ECE,University of IIIinois at Urbana-Champaign

出　　处：《地球物理学报》2000年第2期145-151,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金!49984001;49674241;教育部博士学科点专项基金

摘　　要：为考察赤道异常区电离层对中等强度磁暴的响应特性，用电离层ＣＴ成像方法重建电离层电子密度二维剖面．重建结果表明，暴时低纬电离层电子密度以降低为主，但暴相随纬度和高度而异；磁暴期间，赤道异常峰结构仍然存在，但恢复相期间峰的位置向赤道移动；磁暴急始之后约２０ｍｉｎ，在赤道异常峰区出现电子密度深度耗空，这种耗空遍及从底到顶的整个Ｆ区，朝赤道一侧显现水平梯度非常大的陡壁．这种与磁暴急始相联系的电子密度深度耗空现象很有意义，值得进一步研究．In this paper computerized ionospheric tomographic technology has been applied to investigate low-latitudinal ionospheric behavior during a moderate magnetic storm. From CT reconstructed imaging, during the main phase and recover phase both of positive and negative storm phases in low latitudinal ionosphere are seen and they are not only latitude dependent but also height dependent. It is certainly identified that a deep depletion in electron density occurred just about 20 minutes after ssc at geomagnetic latitudes around 10° where equatorial anomaly crest seats usually. The depleted hole extends over both the bottom and top F-region, with a steep wall on its equatorial side. This is a very interesting low-latitude ionospheric response to initial phase of storm and worthy of further study.

关 键 词：低纬电离层 CT成像 磁暴 电离层暴 

分 类 号：P318.22[天文地球—固体地球物理学] P352[天文地球—地球物理学]