Study of SED's emission parameters

International audienceThe present research is devoted to the study of parameters of Saturn Electrostatic Discharges (SED) according to the data obtained during the observations of the initial period of storm J (December 2010) or the so-called Great White Spot (GWS). The ground-based detection was provided by the Ukrainian radio telescope UTR-2 at frequencies from 8 to 33 MHz in a wide range of time scales: from the day-to-day SED investigations to the temporal fine structure study up to microseconds. In this paper we describe our methods of data cleaning and the search for Saturn lightning in detail. The sensitivity of the observations allowed us to resolve the temporal micro-structure of lightning discharges. We determined the average signal's dispersion delay for a session equal to (4.4 +- 0.8)*10^{-5} pc cm^{-3}. It is close to the predicted value along the ray path from the storm to the radio telescope