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Information × Registration Number 0225U000195, (0124U003936) , R & D reports Title Studying the global lightning activity, climatic changes and conditions in the lower ionosphere based on the data of ELF and VLF measurements at the "Akademik Vernadsky" station and spatially separated sites popup.stage_title Дослідження надпотужних грозових розрядів i характеристик нижньої іоносфери методом синхронних спостережень наднизькочастотних сплесків і атмосфериків у дуже низькочастотному діапазоні Head Sopin Andrii O., Кандидат фізико-математичних наук Registration Date 07-01-2025 Organization Radio Astronomical Institute of the National Academy of Sciences of Ukraine popup.description1 Studying the global lightning activity and conditions in the lower layers of the ionosphere by processing and analysis of ELF and VLF data measurements at the Ukrainian Antarctic "Akademik Vernadsky" station and other measuring points in the Polar Regions. popup.description2  The aim of the project is to study global lightning activity and conditions in the lower ionosphere through the processing and analyzing of ELF and VLF measurement data from the Akademik Vernadsky station and other measurement sites in the Polar Regions. The research includes a study of long-term dependences of the electromagnetic manifestations of lightning discharges and their behavior during geophysical disturbances based on observations of ELF bursts at the UAS and in the Northern Hemisphere. Additionally, the study examines powerful lightning discharges and parameters of the lower ionosphere using records of tweek-atmospherics in the VLF range. The project analyzed the results of processing of ELF and VLF measurements data, accumulated at the UAS during 2023-2024. Seasonal variations in the intensities and peak frequencies of Schumann resonances (SR), as well as their changes depending on the 11-year cycles of solar activity were obtained. Daily and seasonal patterns of thunderstorm centers' behavior were identified based on two-position location of ELF bursts. The ELF interference at the UAS was analyzed and proposals for the relocation of the ELF system outside Galindez Island were formulated. Using numerical modeling a method for determining of electron density in the lower ionosphere based on multimodal tweek-atmospherics was investigated. The numerical study examined the impact of five parameters on electron density for realistic values of the input parameters. Based on the VLF fields observations the parameters of lightning discharges and characteristics of the lower ionosphere at distances up to several thousand kilometers from UAS were obtained. The locations of lightning discharges, the heights and electron density in lower ionosphere were determined. Daily and seasonal patterns in the tweek registrations and parameters of the lower ionosphere were analyzed. The influence of solar activity on VLF transient registrations and SR parameters was analyzed. Product Description popup.authors Bondarenko Liubov O. Budanov Oleh V. Horishnia Yuliia V. Zalizovskyi Andrii V. Kashcheiev Serhii B. Koloskov Oleksandr V. Lysachenko Volodymyr M. Lytvynenko Halyna V. Rokhman Anatolii H. Seluianov Oleksandr V. Sopin Andrii O. Tokarska Liudmyla D. Topchii Maryna A. Yampolskyi Yurii M. popup.nrat_date 2025-01-07 Close