[PPS01-P09] A simulation study on solar wind influence on long-term variation of Jovian Synchrotron Radiation
Keywords:Hisaki, Jupiter, Synchrotron, Radiation, Solar
In our study, we have made a radial diffusion model taking Hisaki's observation result into account that dawn-to-dusk electric field is present and is modulated with solar wind dynamic pressure. New diffusion coefficient is applied here in terms of solar wind dynamic pressure, and relative JSR amplitude is calculated according to the pressure variation between 1971 and 2005. By comparing with an observation at 2.3 GHz, we present our result that JSR amplitude of 20 ~ 30 % and a strong correlation between JSR and time-shifted solar wind dynamic pressure can be sucessfully recovered between 1971 and 1989, and discuss why and how long-term variation happens. For the period later than 1989 where the correlation is mostly lost, one might have to look for another possibility (e.g. active volcanic Io's activity).