Solar activity at Saturn’s magnetosphere environment: Case study of Type III radio bursts

We investigate Type III solar radio bursts observed by the radio and plasma wave experiment (RPWS) onboard Cassini spacecraft (Galopeau et al., 2007) in the period from January 2004 to September 2017. In this time interval of about thirteen years an important number of solar Type III bursts has been recorded. We consider in this work the remote sensing of the Saturn’s magnetosphere environment using the daily RPWS dynamic spectra in the frequency range from 1 Hz to 16 MHz. In spite of the enormous distance between the Sun and Saturn, in the order of ~ 1.5 109 km, this instrument detected Type III bursts superposed to magnetospheric auroral activity emitted by Saturn (Boudjada et al., 2023). We underline in this analysis on particular solar radio bursts which exhibit saturated intensity levels, like the Saturnian kilometric radiation (SKR). We attempt to discuss the origin of the saturated and boosted Type III bursts, drifting rapidly from high to low frequencies, and considered to be generated in the solar corona following Archimedean spiral linked to the solar magnetic field expansion in the interplanetary medium.References:Boudjada et al., Statistical analysis of Solar Type III radio bursts observed by RPWS experiment in 2004-2017 during the Solar cycles 23-24. In Proceedings Kleinheubach Conference, Ed. U.R.S.I. Landesausschuss in Deutschland e.V., IEEE, Miltenberg, 2023. Galopeau et al., Spectral features of SKR observed by Cassini/RPWS: Frequency bandwidth, flux density and polarization. Journal of Geophysical Research, 112, A11, 2007.