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Information × Registration Number 0226U000149, (0125U003103) , R & D reports Title Study of Climate Changes in the Lower Ionosphere and Global Thunderstorm Activity Based on ELF and VLF Radio Diagnostics at the Akademik Vernadsky Station and at Spatially Distributed Observation Sites popup.stage_title Дослідження надпотужних грозових розрядів і характеристик нижньої іоносфери методом синхронних спостережень наднизькочастотних сплесків і атмосфериків у дуже низькочастотному діапазоні Head Koloskov Oleksandr V., Доктор фізико-математичних наук Registration Date 05-01-2026 Organization Radio Astronomical Institute of the National Academy of Sciences of Ukraine popup.description1 Study of global thunderstorm activity, retrieval of parameters of powerful lightning discharges and the lower ionosphere, as well as investigation of the characteristics of natural electromagnetic fields in the ELF and VLF ranges, based on the processing and analysis of radio diagnostic data obtained at the Ukrainian Antarctic Station “Akademik Vernadsky” and other spatially distributed observation sites. popup.description2 The existing database of Schumann resonance, available since 2002, has been supplemented with data for 2024–2025, and analyzed as a function of local time, season, and the 11-year solar cycle. New analysis methods have been developed, enabling evaluation of long-term changes in global thunderstorm activity and the state of the lower ionosphere. A database has been created and the characteristics of emissions from global power grids and the electromagnetic environment at the UAS in the ELF range have been analyzed. The optimal configuration for ELF recording equipment at the UAS was determined. The structure of the hardware-software complex and the methodology for recording ELF signals at an autonomous site outside Galindez Island were established. A database of synchronous atmospheric recordings from three widely separated observation sites, including the UAS, as well as a dataset of ELF transient parameters recorded at the UAS and in the Arctic, has been created. A combined lightning-location algorithm based on the measurement of time-difference and azimuth-of-arrival of atmospherics has been developed and implemented. Spatial distributions of lightning have been reconstructed from multi-station ELF atmospheric measurements, and compared with data from the global WWLLN lightning-location network. Characteristics of extremely powerful lightning discharges have been obtained. Using tripoint lightning-location data, estimates of lower-ionosphere parameters have been derived, including variations in the effective reflection height for the first three transverse waveguide modes, the lower ionospheric boundary, and electron-plasma concentration from the dispersion characteristics of ELF transients, and their seasonal variations have been examined. Product Description popup.authors Halyna V. Lytvynenko Horishnia Yuliia V. Andrii V. Zalizovskyy Andrii O. Sopin Oleksandr V. Koloskov Volodymyr M. Lysachenko Serhii B. Kashcheiev Liudmyla D. Tokarska Maryna O. Reznychenko Liubov O. Bondarenko Alisa O. Shvets Tamara A. Soina popup.nrat_date 2026-01-05 Close