BOOK OF ABSTRACTS AND CONTRIBUTED PAPERS - International scientific conference: Meeting on new trends in Astronomy & Earth Observation, Page 28-30, https://doi.org/10.69646/aob241206
BOOK OF ABSTRACTS AND CONTRIBUTED PAPERS - International scientific conference: Meeting on new trends in Astronomy & Earth Observation, November 25-29, 2024, Belgrade, Serbia, Edited by Vladimir A. Srećković, Aleksandra Kolarski, Milica Langović, Filip Arnaut and Nikola Veselinović
Published by: Scientific Society Isaac Newton Belgrade

Abstract: Monitoring of the ionosphere enables the detection of changes that are related to numerous processes on Earth. However, space weather, primarily solar radiation, has a very significant influence on the atmospheric layers. Variations caused by these influences can be affected by some processes on Earth, which can be used to detect relevant terrestrial processes. On the other hand, the strong influence of solar radiation can mask changes due to processes on Earth. Therefore, it is important to examine the impact of space weather on the detection of changes in signals associated with natural hazards. Natural hazards events like earthquakes or volcanic eruptions could significantly excite lithosphere – atmosphere– ionosphere coupling (LAIC) up to high altitudes with different physical processes. However, the impacts of specific phenomena are complex and the details are still difficult to disentangle.This study considers selected earthquakes (USGS catalogue) with magnitude M ≥5.5 related to LAIC coupling processes based on the combining of ground-based sub-ionospheric VLF/LF electric field measurements from the INFREP network and complementary low earth orbit (LEO) satellite magnetic field measurements. Ground- based and space borne observations require temporal and spatial proximity to the events.We investigate electric field narrowband VLF/LF transmitter signals propagating in the ionospheric waveguide and detected by two INFREP receiving stations in Belgrade (Serbia) and Graz (Austria). It encloses areas along the radio paths from the lithosphere and up to the ionospheric D/E-layers. The analyses are carried out in the time- and frequency-domain and are restricted to European sites due to the INFREP network infrastructure. Complementary magnetic field measurements are obtained by ESA’s three satellite Swarm mission at~500 km altitude (ionospheric F-region). Case studies like the 29.12.2020 earthquake, M6.4, Petrinja, Croatia, and the 06.02.2023 Turkey-Syria ... - FULL TEXT available in PDF.