Updated Model Parameters of Current Sheet and Magnetic Field in the Jovian Magnetosphere for Pre‐Galileo, Galileo, and Juno Eras

Abstract

AbstractIn Jupiter's magnetosphere, the electric current system within the “current sheet” generates a magnetic field, which is comparable to or dominating the Jovian intrinsic field in the magnetosphere. However, updates of an existing model of the magnetospheric field by Khurana (1997, https://doi.org/10.1029/97JA00563) using newly acquired data by Galileo and Juno has never been conducted since it was first formulated. Here we used the data by Voyager 1/2, Galileo, and Juno to revise the current sheet shape model parameters as well as those of the magnetospheric field based on each spacecraft data. We derived fits that reproduced each data well, and revealed long‐term variations of both current sheet and magnetospheric field parameters over several decades. The updated model parameters are useful for detecting dynamic events in the magnetosphere such as magnetopause deformation and plasmoid generation. They can also be used as external fields necessary for probing into the Galilean icy moons by electromagnetic induction methods.