Mylostna K. Radio emissions of lightning in the atmospheres of the planets

The research object: lightning in the atmospheres of the Solar system planets. The purpose of the thesis: to determine basic characteristics and temporal structure of lightning radio emission in the atmosphere of Saturn by means of ground-based radio astronomy facilities. Methods: mathematical methods of signal processing, methods of radio-astronomy observations. Practical significance: the developed algorithms of searching and analysis of Saturn electrostatic discharges will be applied to data processing of upcoming observations of sporadic planetary radio emission moreover they can be applied to searching and studying of pulsed signals of different nature, observed with high time and frequency resolution. The created on-line database of Saturn lightning will be used for the detailed comparison of the Cassini spacecraft and ground-based radio-telescopes records. Scientific novelty: for the first time we have observed Saturn lightning with time resolution of 15 ns. For the first time we have revealed a multi-level temporal structure of Saturn electrostatic discharges and its statistical dependencies have been studied. An average dispersive delay has been determined for the lightning signals on the way of their propagation. The studies have revealed such lightning parameters as characteristic duration, flux density, spectrum in the decameter wave range and energetics of discharges. We have found intrinsic differences of terrestrial and Saturn lightning decameter radio emission. Areas of application: astrophysics, radio-astronomy, astronomy.