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本文根据远东地区33个地磁台近20年(1960—1980)年均值的资料,经过11年滑动平均及时间二次项拟合的处理,采用戴劳级数二阶模型和网格化,编制了远东和中国及其邻近地区1965.0—1975.0年代各要素等变线图,结果表明,1975.0年代远东地区长期变化可能在同一源场内出现了两个负值焦点。一个焦点位于中国的中部(45°N,120°E),另一个焦点位于印度半岛之南(30°N,80°E),同时,在中国境内地磁场的年变率,北向强度为~(-(10-15)nT)/年,东向强度为~(-(0-6)nT)/年,垂直强度为~(-(30-40)nT)/年。此外,本文还根据远东地区4个地磁台近100年的资料,编绘了地磁场随时间变化图和长期变化的极谱图,并提出了各台长期变化极谱图的一些特征。
Based on the data from 33 geomagnetic stations in the Far East over the past 20 years (1960-1980), after a 11-year moving average and time quadratic fitting, the second-order model of Déiladorian series and gridding were used to prepare In the Far East and China and its neighboring regions from 1965. 0 - 1975. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0. One focuses on the central part of China (45 ° N, 120 ° E) and the other focuses on the south of the Indian peninsula (30 ° N, 80 ° E). Meanwhile, the annual variation of geomagnetic field in China is ~ (- (10-15) nT) / year, the eastward intensity is ~ (- (0-6) nT) / year and the vertical intensity is ~ (- (30-40) nT) / year. In addition, based on nearly 100 years’ data from 4 geomagnetic stations in the Far East, this paper also compiles the polarographic maps of the geomagnetic field with time and long-term changes and presents some characteristics of long-term polarographic changes.