Substructure Analysis of Jovian S-Burst Observations

As Jovian S-bursts are planetary non-thermal radio emissions with a very intrinsic substructure characteristic, it is necessary to focus on the waveform of these signals. Common techniques suffer on the one hand from the methodology itself (e.g. Fourier) and on the other hand cannot achieve sufficient time-frequency resolution. The wave initiated by the emission phenomenon, the cyclotron maser instability, gets modified through its propagation till the antenna and then further on through the receiver chain. All these effects have been carefully taken into consideration. The waveform receiving system WFR is a fully digital broadband kind of transient recorder. It operates at the borders of at present technology possibilities. Observation campaigns with this device have been carried out at Nançay (France) and UTR-2 (Ukraine). The obtained data are unique since it is possible for the first time to work on broadband waveforms of received S-bursts. Various data analysis techniques, as for example Wavelet transform, visualize the possibilities as well as the problems obtained by this procedure. Finally possible future projects like the usage of the WFR for broadband VLBI or for space applications are discussed. At present an unsurpassed high resolution analysis was done by Carr et.al. 1999. The waveform attempt of Carr et al. is a very promising one. By building a fully digital waveform receiving system, capable of exploring a broad frequency range many instrumental limitations and error sources can be eliminated. >http://www.sympathy.at/sciencs/s_burst/s_bursts.htm</a>