DOI: 10.21455/GPB2017.4-2

DISTRIBUTION OF MAN-MADE LOW FREQUENCY
MAGNETIC NOISE IN A BIG INDUSTRIAL CITY

D.S. Tyagunov

Bulashevich Institute of Geophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia

Abstract. The paper deals with the measurements of technogenic magnetic noise in the frequency range 0.01–200 Hz, which were carried out in the daytime within the central part of Yekaterinburg, the city's bypass road and the Yekaterinburg ring road. The equipment used, measurement technique and methods of data processing are described. On the basis of the results obtained, the magnetic induction module was determined and a map-scheme of the distribution of anthropogenic magnetic noise over the area of Yekaterinburg and in its surroundings was constructed. It is shown that magnetic noise is concentrated in the central regions of the city, and its amplitude can reach ~ 1500 nT. Within the regions near the ring road, magnetic noise decreases to 150 nT. Examples of records of anthropogenic magnetic noise created by the power lines and electric trains of the underground are also given. They show that the amplitude of magnetic noise produced by these sources is much higher than the average intensity of magnetic noise in the central part of the city. We revealed that the amplitude of the vertical component of the magnetic noise, as a rule, was more in comparison to the horizontal components.

Keywords: man-made magnetic noise, electromagnetic noise, magnetic induction, sources of man-made magnetic noise.

TYAGUNOV Dmitriy S. – cand. of tech. sci., scientific researcher, Bulashevich Institute of Geophysics, Ural Branch of the Russian Academy of Sciences. Ekaterinburg, Russia.
Tel.: +7 (343) 267-88-89. E-mail: tds-07@mail.ru