Vestnik КRAUNC. Fiz.-Mat. nauki. 2023. vol. 45. no. 4. P. 201-228. ISSN 2079-6641

INSTRUMENTS AND METHODS OF MEASUREMENT
https://doi.org/10.26117/2079-6641-2023-45-4-201-228
Research Article
Full text in Russian
MSC 86A25

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Possible Railway Effects in Magnetic Measurements at Geophysical Observatory Novosibirsk

S. Y. Khomutov¹^\ast, A. A. Kovalev², A. Y. Gvozdarev¹, N. N. Semakov²

¹Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, 684034 Kamchatka region, Elizovskiy district, Paratunka, Mirnaya str., 7, Russia
²Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, 630090 Novosibirsk, Koptug ave. 3, Russia

Abstract. After renewing the Geophysical Observatory Novosibirsk (NVS) from analog photorecording to digital magnetometers, noise in the form of spikes and short jumps of records with an amplitude of up to several nT, which were not previously visible, appeared in the measurement results. The main effect was observed in the vertical intensity Z and total field intensity F. A direct current railway running 12 km west of the observatory was considered as a possible source of these disturbances. In 2006-2012, route surveys of F were carried out along two profiles of different lengths, approximately perpendicular to the railway. It has been shown that the noise amplitude decreases linearly with the distance from the source. An attempts were made to identify the noise origin, linking them with the schedule of trains. A review of recent work on the problem of the railways and subways effects on the results of magnetic measurements at observatories, field measurements and magnetotelluric sounding is made. Magnetic effects in the vertical and horizontal components of the field are calculated within the framework of a simple leakage current distribution model that takes into account the presence of a high-resistance foundation in the geoelectric section in the observatory area. The model provides only a partial explanation of the observed effects. There has been a tendency to decrease the intensity of interference in recent years.

Key words: magnetic observatories, noise, railway

Received: 17.11.2023; Revised: 05.12.2023; Accepted: 13.12.2023; First online: 14.12.2023

For citation. Khomutov S. Y., Kovalev A. A., Gvozdarev A. Y., Semakov N. N. Possible railway effects in magnetic measurements at Geophysical Observatory Novosibirsk. Vestnik KRAUNC. Fiz.-mat. nauki. 2023, 45: 4, 201-228. EDN: UGPBOY. https://doi.org/10.26117/2079-6641-2023-45-4-201-228.

Funding. The work of S. Y. Khomutov and A. Y. Gvozdarev was carried out within the framework of the State task on the topic (2021—2023) «Physical processes in the system of near space and geospheres under solar and lithospheric impact», registration number AAAA-A21-121011290003-0. The work of A. A. Kovalev and N. N. Semakov was carried out with the financial suppor of the Ministry of Education and Science of the Russian Federation (project FWZZ-2022-0019).

Competing interests. There are no conflicts of interest regarding authorship and publication.

Contribution and Responsibility. All authors contributed to this article. Authors are solely responsible for providing the final version of the article in print. The final version of the manuscript was approved by all authors.

^\astCorrespondence: E-mail: khomutov@ikir.ru

The content is published under the terms of the Creative Commons Attribution 4.0 International License

© Khomutov S. Y., Kovalev A. A., Gvozdarev A. Y., Semakov N. N., 2023

© Institute of Cosmophysical Research and Radio Wave Propagation, 2023 (original layout, design, compilation)

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