Terminator variations of VLF/LF amplitudes - observational techniques and case studies

AbstractThe VLF/LF Earth-ionosphere waveguide enables the remote detection of important variabilities related to environmental and solar processes. Two case studies have been considered with medium and high solar activities, both recorded by Belgrade (Serbia) and Graz (Austria) stations. This study shows the existence of electric field amplitude wave phenomena with periods of ~500 sec during terminator times. Our findings underscore the importance of measurement networks for future surveys. - FULL TEXT available in PDF.