1997—2016年中国大陆地区地磁台站观测环境变化定量分析

本文利用CHAOS-6地磁场模型计算1997—2016年中国大陆地区34个地磁台站模型值，分析比较模型计算值与台站实测值之间的差异，利用国际参考场模型IGRF12计算结果进行佐证。结果表明:地磁异常场模量△T作为地磁台站观测环境的一种标志，年变化显示:①中国大陆地区34个地磁基准台绝大部分位于地磁正常区或弱磁异常区，只有少数几个地磁台位于强磁异常区；②判断1个地磁台的地磁场环境，只测量总强度（F）是不够的，必须进行三分量绝对观测，利用地磁异常场模量△T评价地磁台的地磁场环境更全面、更科学合理。

Quantitative Analysis of the Observed Environmental Changes of Geomagnetic Stations in Mainland China from 1997 to 2016

Using CHAOS-6 geomagnetic field model, we calculated the model values of 34 geomagnetic stations between 1997-2016 in mainland China. By analyzing and comparing the model calculation value and the observation value, and the difference between using IGRF12 calculation results, we found that the geomagnetic anomalous field modulus(△T) is a good indicator of the geomagnetic station observation environment. Our results show that:①for the most part the geomagnetic normal area or weak magnetic anomaly area of 34 geomagnetic stations in mainland China, only a handful of geomagnetic station located in the strong magnetic anomaly zone, ②to judge the geomagnetic field environment of a geomagnetic platform, it is not enough to make the measurement of total strength (F) only, but to make the absolute observation of three components. Instead, it will be more comprehensive, more scientific and reasonable by using the modulus of geomagnetic anomalies (△T) in evaluating the geomagnetic field environment of a geomagnetic platform in future.