西藏羊八井地区近地晴天大气电场周期变化  

Periodic Variations of Fair-Weather Atmospheric Electric Field Near Ground in Yangbajin of Tibet

作　　者：徐斌[1] 张颖[1] 贾焕玉[1] 陈天禄[2] 袁爱芳[2] 孟宪茹[2] 

机构地区：[1]西南交通大学现代物理研究所,四川成都610031 [2]西藏大学宇宙线研究所,西藏拉萨850000

出　　处：《高原气象》2009年第2期314-318,共5页Plateau Meteorology

基　　金：国家自然科学基金项目(10120130794)资助

摘　　要：基于西藏ARGO-YBJ实验,分析了2005年12月—2007年9月期间西藏羊八井地区近地晴天大气电场强度的周期变化,并重点讨论了其太阳日周期的相位变化。结果表明,晴天状态下大气电场强度存在明显的半日周期和太阳日周期变化。太阳日周期的相位变化呈现大陆复杂型(双峰、双谷),日变化曲线随季节变化,在冬季,电场强度水平较高,最大日变化幅度约30%;春、夏季电场强度水平较低,最大日变化幅度约15%。该初步研究结果对了解西藏地区晴天大气电特征具有十分重要的意义。Based on the ARGO-YBJ experiment in YBJ of Tibet, the periodicities of fair-weather atmospheric electric field near ground are analyzed and the actions of solar diurnal periodicity are discussed using the data of fair-weather atmospheric electric field from December 2005 to September 2007. The resuits show that the periodicities of solar diurnal and semi-diurnal are found with large enough significance. The phase distribution of solar diurnal present a perplexing type （dual-peak and vale）, and the curves change along with seasons. The intensity of atmospheric electric field is bigger in winter than in spring and summer, the maximal extent of diurnal variation is about 30% in winter and 15% in summer. These preliminary results are very significant in understanding the actions of fair-weather atmospheric electricity in Tibet.

关 键 词：晴天大气电场 周期变化 相位分布 

分 类 号：P427.3[天文地球—大气科学及气象学]