[PPS01-P03] Magnetic field model of Jovian magnetosphere
The configuration of the Jovian current sheet was modeled by Khurana  using three parameters, while the Jovian magnetospheric magnetic field modeled by Khurana  was characterized by 14 parameters. We applied a non-linear optimization technique, i.e., the steepest descent method, to the parameters by newly adding magnetic data from Galileo and Juno spacecrafts. We minimized the root mean squared between the model and the data by exploring the parameter space around several initial sets of the parameters.
As a result, time-varying model parameters for each spacecraft orbit were obtained. Their temporal variation may reflect that of both magnetic field and electric current system in the Jovian magnetosphere.The changes of the parameters can be attributed to the interaction between the Jovian magnetosphere and the solar wind. It, therefore, preferable that the temporal variation of the model parameters is incorporated when the updated magnetic field model of the Jovian magnetosphere is applied to the EM induction studies in search for the internal oceans of the icy satellites.