摘要
基于乌鲁木齐地电场观测资料,运用谐波拟合等数据处理方法,从日变化形态、优势方位角、优势周期、极化特征等方面分析地电场变化特征,可知:①乌鲁木齐地电场各测道日变化基本呈"两峰一谷"形态,能清晰记录地电暴数据,地电暴日形态为突跳、阶跃、震荡等,在发生地电暴时EW测道变幅较NS测道大.②各测道优势方位角较稳定,αNS/NE-L、αEW/NE-L、αNS/NE-S、αEW/NE-S基本保持在 59.24°、47.32°、64.94°、50.65°(±45°).③磁静日期间,地电场数据优势周期有 12 h、6 h、8 h、24 h等;地电暴发生时,4.8 h、3 h、1.4 h、0.6 h等较短周期成分更加突显.④磁静日和地电暴期间,乌鲁木齐地电场均表现出非线性极化特征.
Abstract
Harmonic fitting are used to analyze the variation characteristics of geoelectric field from the aspects of diurnal variation form,dominant azimuth angle,dominate period and polarization characteristics.The results are:① The diurnal variation form of geoelectric field in Urumqi is basically in the form of"two peaks and one valley",which can clearly record the data of geoelectric storm.The diurnal morphology of geoelectrical storm is sudden jump,step and shock,etc.The variation amplitude of the EW track is larger than that of the NS track when the geoelectrical storm occurs.② The dominant azimuth of each channel is stable,and αNS/NE-L,αEW/NE-L,αNS/NE-S,αEW/NE-S basically remain at 59.24°,47.32° 64.94°,50.65°(±45°).③ During the magnetostatic days,the dominant period of geoelectric field is 12 h,6 h,8 h,24 h,etc.When the geoelectric storm occurs,the shorter period components such as 4.8 h,3 h,1.4 h,and 0.6 h are more prominent.④ The geoelectric field in Urumqi shows nonlinear polarization characteristics no matter in static day or geoelectric storm.
维普
万方数据