基于地磁逐日比异常期间地磁垂直分量日变化幅度变大或变小的统计结果,发现地磁逐日比高值异常是由异常日的地磁垂直分量日变化幅度变小和异常前一天的日变化幅度变大所致。其中,异常日的日变化幅度变小可能是地磁逐日比异常的主要因素,但异常前一天的日变化幅度变大也是异常成立的重要因素。此外,引用前人感应电流假说,结合统计结果进行了机理解释,研究结论进一步证实了前人对该方法的机理推测。

Base on the statistical results of increase or decrease of geomagnetic vertical component daily variation amplitude during abnormal geomagnetic daily ratio period,we found that the abnormal high value is caused by the decrease of the geomagnetic vertical component daily variation amplitude during the abnormal day and the increase during the day before anomaly. The decrease of daily variation amplitude of abnormal day may be the main cause of geomagnetic daily ratio anomaly. However,the increase of daily variation amplitude of the day before anomaly is also an important factor too. We established an electromagnetic model to explain the mechanism in this paper,and our results confirm the speculation on the mechanism of this method by previous studies.

P315