A Jovian Magnetodisc Model for the Juno Era
| Autor: | J. L. Joergensen, S. Timmins, Matija Herceg, John E. P. Connerney |
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| Rok vydání: | 2020 |
| Předmět: |
Angular momentum
010504 meteorology & atmospheric sciences Magnetosphere magnetic field Astrophysics Juno spacecraft 01 natural sciences Magnetosphere Interactions with Satellites and Rings Jovian Jupiter Magnetospheric Physics Planetary Sciences: Solid Surface Planets Planetary Sciences: Fluid Planets Research Articles 0105 earth and related environmental sciences Physics Magnetospheric Configuration and Dynamics Radius Planetary Magnetospheres Jupiter Midway Through the Juno Mission Magnetic field Orbit Geophysics Space and Planetary Science Magnetospheres Physics::Space Physics magnetodisc magnetosphere Planetary Sciences: Comets and Small Bodies Astrophysics::Earth and Planetary Astrophysics Ring Current Longitude Research Article |
| Zdroj: | Journal of Geophysical Research. Space Physics Connerney, J E P, Timmins, S, Herceg, M & Jørgensen, J L 2020, ' A Jovian Magnetodisc Model for the Juno Era ', Journal of Geophysical Research: Space Physics, vol. 125, no. 10, e2020JA028138 . https://doi.org/10.1029/2020JA028138 |
| ISSN: | 2169-9380 |
| Popis: | The Jovian magnetosphere assumes a disc‐like geometrical configuration (“magnetodisc”) owing to the persistent presence of a system of azimuthal currents circulating in a washer‐shaped volume aligned with, or near, the magnetic equatorial plane. A Voyager era empirical model of the magnetodisc is fitted to vector magnetic field measurements obtained during the Juno spacecraft's first 24 orbits. The best fitting (within 30 Jovian radii) magnetodisc model is characterized by an inner and outer radius of 7.8 and 51.4 Jovian radii, a half‐thickness of 3.6 Jovian radii, with a surface normal at 9.3° from the Jovigraphic pole and 204.2° System 3 west longitude. We supplement the magnetodisc model with a second current system, also confined to the magnetic equatorial plane, consisting of outward radial currents that presumably effect the transfer of angular momentum to outward flowing plasma. Allowing for variation of the magnetodisc's azimuthal and radial current systems from one 53‐day orbit to the next, we develop an index of magnetospheric activity that may be useful in interpretation of variations in auroral observations. Key Points An empirical magnetodisc model is fitted to the Juno magnetic field observationsThe magnetodisc model provides a more accurate representation of the magnetic field in the inner and middle magnetosphere of JupiterThe model is independently tested via observations of charged particle interactions with the Jovian satellites |
| Databáze: | OpenAIRE |
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