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The distribution characteristics of short period geomagnetic variations in Shaanxi region

In order to 
investigate the characteristics of short period geomagnetic variations in Shaanxi region, a 
temporary measurement profile from Shiquan in the southern part of Shaanxi to Ningxian in 
Gansu was set up in September of 1996 to carry out simultaneous observation of three 
component geomagnetic variations along the profile. The vertical transfer functions, the 
horizontal transfer functions and the spectral component′s relationship of each period 
segment at each site in the period range from 3 min to 2 h were statistically calculated. Random 
data theory was applied to the data processing for reference, which led to a relatively good 
result. Analysis of the data point out that short period geomagnetic variations are affected by 
the regional influence of underground anomalous inductive current concentration between 
Wugong and Qianling in the nearly E W direction and by the influence of local inductive current 
in nearby area of measurement site. The main distribution feature is that vertical transfer 
functions reverse between Wugong and Qianling and frequency responses of the transfer 
functions have maximum at period about 20 min.