Geophysical research: article

ELECTROMAGNETIC ULF NOISES, CAUSED BY THE VOLCANIC LIGHTNINGS OF THE TONGA VOLCANO
D.A. Stukov V.A. Pilipenko
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Geophysical research
Tome: 25
Number: 4
Year: 2024
Pages: 81-90
UDK: 523.31-853
DOI: 10.21455/gr2024.4-4
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Keywords: volcanic eruption, Schumann resonance, Pc1 emissions, ionospheric waveguide.
Аnnotation: The eruption of the Tonga volcano on January 15, 2022, and the intense lightning activity that accompanied it led to the occurence of electromagnetic oscillations in different frequency ranges. The properties of these oscillations were analyzed using data from induction magnetometers in the Far East, located at a distance of about 8000 km from the eruption area. The expected increase in the intensity of the Schumann resonance (frequency ~8 Hz) was noted during periods of the greatest lightning activity. The appearance of broadband emissions of the Pc1 range (2–5 Hz) stimulated by volcanic lightnings has been detected. These emissions are presumably the result of the excitation of a large number of the magnetosonic waveguide modes in the upper ionosphere by lightning discharges.