强磁扰对视电阻率观测的影响

Effect of Strong magnetic perturbation on observation of apparent resistivity

基于地球天然交变电磁场的基本理论，研究了磁静日、磁暴时的视电阻率的变化特征。结果显示：磁暴时ρＳ有明显变化，一般大于或等于２倍的磁静日的标准差。同时发现，由于地下介质的不均匀性，天然交变电磁场各种频率成份对地下电性介质的贡献不同，集肤效果也不同，从而使得在同一地电台、相同观测环境、相同观测条件下，磁暴时地电阻率的测道的差异，其干扰水平显示出明显的方向性。最后对研究中所发现的一些问题尽可能地给予了物理解释。

Based on the fundamental theory of natural alternating electromagnetic field,we have studied the varying characteristics of apparent resistivity during magnetically quiet day and magnetic storm.The results show that the apparent resistivity has remarkable change during magnetic storm which generally is larger than or equal to two times of standard deviation of magnetically quiet day.We have discovered that as the inhomogeneity of the under groud medium,the contribution of various frequency contents of natural alternating electromagnetic field to the underground electric medium is different,and the effect of tendingskin is also different.Thus under the premise at the same geoelectric station,with the same observing environment and the same observing condition the disturbed level of the observing line difference of earth resistivity during magnetic storm shows obvious direction nature.Finally we gave explanations as fully as possible to some questions found in the study.