geomagnetic activity index
地磁活动指数 geomagnetic activity index 午夜前睡一小时抵得上午夜后睡三小时。 one hour's sleep before midnight is worth three after.
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·2,447,543篇论文数据，部分数据来源于NoteExpress
结果指出，广州地磁Z分量日变幅的年平均与太阳活动指数F_（10.7）的年平均存在良好的线性相关；
The results show that, the annual averages of daily variations of Z are favorably linearly correlative with the annual averages of the F_(10.7);
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