Abstract
Abstract. One of the main features of Jupiter's magnetosphere is its equatorial magnetodisc, which significantly increases the field strength and size of the magnetosphere. Analysis of Juno measurements of the magnetic field during the first 10 orbits covering the dawn to pre-dawn sector of the magnetosphere (∼03:30–06:00 local time) has allowed us to determine optimal parameters of the magnetodisc using the paraboloid magnetospheric magnetic field model, which employs analytic expressions for the magnetospheric current systems. Specifically, within the model we determine the size of the Jovian magnetodisc and the magnetic field strength at its outer edge.
Highlights
In this paper we consider magnetic field measurements made by the Juno spacecraft in Jupiter’s magnetosphere, paying particular attention to the middle magnetosphere measurements where Jupiter’s magnetodisc field plays a major role
We model the magnetic field observations during Juno’s first 10 orbits for which both inbound and outbound passes are presently available, corresponding to perijoves (PJs) 0 to 9, using the semi-empirical global paraboloid Jovian magnetospheric magnetic field model derived by Alexeev and Belenkaya (2005)
We focus on the middle magnetosphere, observed on these orbits in the dawn to pre-dawn sector of the magnetosphere (∼03:30–06:00 local time, LT), for which the magnetodisc provides the main contribution to the magnetospheric magnetic field
Summary
In this paper we consider magnetic field measurements made by the Juno spacecraft in Jupiter’s magnetosphere, paying particular attention to the middle magnetosphere measurements where Jupiter’s magnetodisc field plays a major role. The empirical magnetodisc model presented by Connerney et al (1981), derived from Voyager-1 and -2 and Pioneer-10 observations, has been employed as a basis in numerous subsequent studies, including predictions for the Juno mission by Cowley et al (2008, 2017). We note that the magnetodisc may be regarded as the most important source of magnetic field in Jupiter’s magnetosphere, with a magnetic moment in the model derived by Alexeev and Belenkaya (2005) using Ulysses inbound data, for example, which is 2.6 times the planetary dipole moment. Wind and is an appropriate focus of a study using Juno magnetic field data
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