Axially Asymmetric Steady State Model of Jupiter's
Magnetosphere-Ionosphere Coupling
Abstract
We present an axially asymmetric steady state model of Jupiter’s
magnetosphere-ionosphere coupling, including precipitation-induced
enhancement of the ionospheric Pedersen conductivity. We compare the
magnetodisc current intensities calculated using this model with those
determined directly from magnetic field measurements in various local
time sectors, and find that the observed radial current intensities
require an average radial mass transport rate of magnetospheric plasma
of 2000 kg s-1. Models with a traditional mass
transport value of 1000 kg s-1 produce significantly
weaker radial currents than observed. We also study the effect of
additional field-aligned currents associated with Jupiter’s nightside
partial ring current and find that their inclusion leads to much better
agreement between the model and observed magnetodisc radial currents in
the region beyond ~40 Jupiter radii.