Analysis on variation characteristics of geoelectric field in Urumqi
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.
万方数据
维普
