REGIONAL DIFFERENCE FOR THE SECULAR VARIATION OF GEOMAGNETIC FIELD IN NORTH CHINA AREA

This paper, by Taylor's quadratic pol hernial surface fitting method given in Reference(1), analyses the regional difference of the annual variationa rate of observed data of geomagnetic total field F and Z component from 21 geomagntic station in 1980-1987 and describes the time-space charateristics of secular variations in geomagnetic field in another aspect, achieving our aim in fitting and prediction. The effect from outer space disturbanceon the systematic fitting deviaton of annual variational rate in Reference(1) has been remove by this mehtod. Such data are easier to be used in secular variation corrected of the difference between two stations in geomagnetic observation and prediction and will be a certain value in practical applications. This paper is one of the results of the studies on "Characteristic of Geomagnetic Regional background Variations and Its Application in Earthquake Prediction" funded by the Scientific Foundation of S. S. B.