Determining the Amplitude Transfer Function of the Permanent Magnetic ELF Measurements of the Széchenyi István Geophysical Observatory

Bozóki, Tamás and Bór, József and Szabóné André, Karolina and Piri, Dániel and Novák, Attila and Molnár, Csaba and Sátori, Gabriella (2025) Determining the Amplitude Transfer Function of the Permanent Magnetic ELF Measurements of the Széchenyi István Geophysical Observatory. GEOPHYSICAL OBSERVATORY REPORTS OF THE INSTITUTE OF EARTH PHYSICS AND SPACE SCIENCE, 2023–2. pp. 41-49. ISSN 2939-5062

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Abstract

In July 2020, a detailed ELF/VLF noise test was carried out in the Széchenyi István Geophysical Observatory. This test included the temporary installation of a pair of LEMI-type induction coil magnetometers that run from a battery during the test period (9 July 2020) when the power supply of the observatory was gradually shut down. As the temporary coils were installed two days before the test day (7 July) and continued to operate until the 13rd of July, there were several days when both the permanent and temporary systems were in operation. In this study, we use this overlapping period to further investigate electromagnetic noises present in the observatory and to determine the amplitude transfer function of the permanent ELF-band recording system based on the calibrated temporary measurements.

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