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. 2020 Mar 6;10:4219. doi: 10.1038/s41598-020-60793-x

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The spatial extent and harmonics of the AC fields, exemplified by the CSC. (a) The spatial extent of the measured AC fields; the total magnetic AC field (upper) and the total electric AC-field (lower). (b) The estimated spectra from the Power Spectral Densities (PSD for transect 7, black lines) during operation at 345 A; the magnetic field (upper) and the electric field (lower). The grey lines show measured background levels. (c) The estimated spectra from the PSD of transect 5 when the CSC was not transferring power but had an electric current of 16 A. In (b,c), the upper panel shows the magnetic AC field (black) and the lower panel the electric AC field (black). Both have the main frequency of 60 Hz identified by a dotted line and the grey lines in (b,c) show the background levels obtained at the reference site (358 m from the cable).