ABOUT AMPLITUDE-FREQUENCY CHARACTERISTICS OF GEOMAGNETIC NOISE IN THE RANGE OF LOW FREQUENCIES

Institute of Geophysics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia

Abstract. The features of geomagnetic noise distribution over frequencies in different bandwidths and in the signal accumulation mode are investigated. It is shown that the amplitude of geomagnetic noise, measured by a magnetomodulate magnetometer in a passband of 0.1–230 Hz at the latitude of the Middle Urals in a quiet geomagnetic field can vary from 0.2 to ~ 2 nT from peak to peak, depending on time and place of measurement. The conditions for measuring a weak magnetic field against a background of geomagnetic noise and the limitations associated with the random nature of changes in the amplitude of geomagnetic noise and the lack of correlation of its amplitude at various measurement points are considered. The obtained data can be used to estimate the amplitude of a weak external magnetic field, which can be recorded in an unperturbed geomagnetic field in unshielded space, which is of interest in magnetobiology and biomedicine.

Keywords: geomagnetic field, geomagnetic noise, amplitude of geomagnetic noise of low frequencies.

About the author

SOKOL-KUTYLOVSKII Oleg L. – Dr. Sci. (Tekh.), senior researcher, Institute of Geophysics, Ural Branch of the RAS. Russia, 620016, Yekaterinburg, Amundsena st., 100. E-mail: s-k52@mail.ru

Cite this article as: Sokol-Kutylovskii O.L. About amplitude-frequency characteristics of geomagnetic noise in the range of low frequencies, Geofizicheskie Protsessy i Biosfera (Geophysical Processes and Biosphere), 2019, vol. 18, no. 2, pp. 119–126 (in Russian). https://doi.org/10.21455/gpb2019.2-10

English version: Izvestiya, Atmospheric and Oceanic Physics, 2019, vol. 55, iss. 8. ISSN: 0001-4338 (Print), 1555-628X (Online). https://link.springer.com/journal/volumesAndIssues/11485