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银川地电台布极区位于银川市中山公园及邻近稻田里。自1972年观测以来,已积累了近12年的资料(图1)。资料除显示明显的年变之外,不同方向的三个测道还呈现了各
Yinchuan to cloth Po District is located in Yinchuan Zhongshan Park and adjacent to the rice fields. Since its observation in 1972, nearly 12 years of data have been accumulated (Figure 1). In addition to the data showing significant changes in the year, the three tracks in different directions are also presented