Science and technological developments: article

P.E. Tereshchenko 1,2
1 St. Petersburg Branch of Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propaga-tion of the Russian Academy of Sciences 2 St. Petersburg Scientific Center of the Russian Academy of Sciences
Journal: Science and technological developments
Tome: 101
Number: 2
Year: 2022
Pages: 33-49
UDK: 537.86
DOI: 10.21455/std2022.2-4
Keywords: ELF, radio wave propagation, electromagnetic field, conductivity, ionosphere, lithosphere
Аnnotation: The results of experimental studies in the wave zone of the field excited by a linear grounded antenna in the frequency range of 0.4–95 Hz are considered. As a result, the influence of the external ionosphere on the magnetic field in the region of frequencies less than 10 Hz is statistically reliably established. Measurements in the ultra-low-frequency and more low-frequency range allowed us to estimate the state of the lower ionosphere and thus show that variations of the measured field in the frequency range less than 10 Hz are due to the influence of the external ionosphere. Comparison of measurement results with natural electromagnetic noise, including its structured part, allowed us to make an assumption about connection of ionospheric resonator and appearance of Alfven resonances with the processes in the Earth's magnetosphere. It is shown that the lithosphere, especially its heterogeneous structure in the field excitation region, plays a significant role in the measured frequency depend-ence of the field amplitude.
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