地磁干扰噪声的实验观测

为探查1988年3月前后在北京地磁台附近出现的较明显的地磁干扰噪声,我们在苏家坨—卧龙岗一带布设了8个测点,开展了专门的地磁干扰噪声实验观测。结果表明,该地磁干扰噪声主要是来自香山一带的电磁干扰,其次是北京市的地铁干扰。此地磁干扰噪声出现于每天06~h—23~h(北京时),其主要频谱成分在短周期(T=2—4 m)部分。另外本文的观测研究方法对于监测地磁台站(测点)的环境状况,改正受污染的地磁资料等方面具有实际应用价值。

EXPERIMENTAL OBSERVATION OF GEOMAGNETIC INTERFERENCE NOISE

To search for the obvious noise of geomagnetic interference occurred near the Beijing observatory round about March of 1988, we set up 8 sites in Sujiatuo-Wolonggang area. The special experimental observation of the geomagnetic interference noise was carried out with the model G-816 and G-826 proton precession magnetometers. The results show that the geomagnetic interference noise mainly originated from the electromagnetic interference in the Xiangshan region, and subsequently from the subway in the Beijing City. The geomagnetic inter-ference noise occurred at 06h-23h (the Beijing time)each day. Its dominant spectrum is at short-period(T=2-4m). The method of the observation and research in this paper has practical application value for monitoring the environmental condition of geomagnetic observatory (site) and for correcting the contaminated data of geomagnetic field.