Analysis of the Influence of Electrified Railways on the Second Value of Z-component in Geomagnetic Observation at Changli Station
The interference of electrified railways on geomagnetic observations is caused on one hand by the ferromagnetic substances of the railway itself,and on the other hand by the magnetic field generated by the high voltage electric arcs during locomotive opera-tion.This paper mainly analyzes the characteristics of the influence of electrified locomotive operation on the vertical component of geomagnetic observation at Changli Station.The results show that the interference pattern is mainly characterized by sudden spikes,with an interference amplitude of about 0.5～5nT;the direction of interference caused by both sides of the electrified railway is oppo-site,while it is the same on the same side;the closer the measurement point is to the railway,the greater the impact on the observa-tion value.Through research and analysis,the impact of the operation of electrified locomotives on the geomagnetic observation val-ues at Changli Station is clarified,providing a reference for the correct application of observation data.
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