We have also calculated the mean daily variation of K index of 31 stations of high latitude during the relative magnetic quiet period of year 1957 and 1958.
与此同时，我们还统计了1957与1958年高纬度区31个地磁台在平静时每天的平均日变化。
We have also calculated the mean daily variation of K index of 31 stations of high latitude during the relative magnetic quiet period of year 1957 and 1958.
与此同时，我们还统计了1957与1958年高纬度区31个地磁台在平静时每天的平均日变化。
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