DIAGNOSTIC OF JUPITER IONOSPHERE AND HIGH-ENERGY ELECTRONS INSIDE THEIO MAGNETIC-FLUX TUBE USING THE DECAMETRIC RADIO-EMISSION

In the present paper S-bursts and narrow-band continuous emission is p roposed to probe conditions existing in the Jovian ionosphere and the Io flux tube. Our assumption is based on the plasma model of generatio n of these emissions according to which plasma waves are excited at th e frequency of upper-hybrid resonance, and then converted into extraor dinary electromagnetic waves at frequencies near the cut-off frequency . Some details of the process of the electron precipitation into the J ovian atmosphere from the Io flux tube are examined, as well, and para meters for precipitating electrons as a function of the parameters of S-bursts and narrow-band emission are found. Series of observational d ata obtained at the Lustbuhel and Nancay observatories are analyzed on the basis of the proposed method with the aim to recognize inherent p henomena and to obtain information about the plasma state in that regi on where the narrow-band emission and S-bursts are generated. We are a lso interested to get information on the electron fluxes precipitating into the Jovian atmosphere. Numerical estimations of the density and particle energy of the injected electrons, plasma density in the sourc e of S-bursts, and the recombination coefficient of the plasma in the Jovian ionosphere are obtained.