地磁低点时间与经度的相关性分析

地磁低点时间在空间分布上的主要特征是随着经度变化而变化。为了求出这种变化关系的解析式,首先使用国家地磁台网的数据计算甘肃省近三年13个地磁台站的低点时间序列和低点时间的期望,并绘制了低点时间序列的频次分布图和概率密度曲线;然后对低点时间与台站经度的关系做线性回归,并指出这个线性回归方程应无限趋近于“格林尼治时间-经度”关系式。文章第一次提出台站经度与地磁Z分量低点时间的关系式,并提出它的趋近方程。各台站低点时间的期望就是地磁低点时间的正常背景值,它是判定地磁低点时间异常与否的参考标准。本文的工作完善和发展了丁鉴海先生的地磁低点位移法。

Correlation Analysis of Geomagnetic Low-point Time and Longitude

The main characteristic of the spatial distribution of geomagnetic low-point time is that it changes with longitude. To solve the analytical formula of the relationship, we first calculated the low-point time sequences and the expected values of the low-point times of 13 geomagnetic stations in Gansu Province. Using nearly three years of data from the national geomagnetic network, the frequency distribution diagram and the normal density curve of the low-point time series were plotted. We then made a linear regression for the relationship between the low-point time of the Z component and longitude of the station, and indicated that the linear regression equation should be infinitely close to the "Greenwich time-longitude" equation. In this paper, the relational expression between the low-point time of the Z component and longitude of the station is first proposed, and the approximation equation of the relational expression is described. The expected value of the low-point time of each station is the normal background value of the geomagnetic low-point time, which is a reference standard to determine whether the geomagnetic low-point time is abnormal. The significance of the above work is to perfect the geomagnetic low-point displacement method proposed by Ding Jianhai.