Numerical Simulations of Dawn-Dusk Asymmetry in Latitudinal Width of the Jupiter's Main Auroral Oval

Details Numerical Simulations of Dawn-Dusk Asymmetry in Latitudinal Width of the Jupiter's Main Auroral Oval Numerical Simulations of Dawn-Dusk Asymmetry in Latitudinal Width of the Jupiter's Main Auroral Oval

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p41c1299t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P41C-1299

Other

2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 5706 Aurorae, 6220 Jupiter, 7833 Mathematical And Numerical Techniques (0500, 3200)

Scientific paper

Dawn-dusk asymmetry in latitudinal width, broad on the dusk side and narrow on the dawn side, has been observed in the Jupiter's main auroral oval. In order to understand the origin of the asymmetry, we investigate the effects of the configuration of the magnetic field lines and fast plasma flows in the magnetosphere using a magnetosphere-ionosphere coupled current model. This model calculates ionospheric conductivity, field- aligned current (FAC), and azimuthal velocity of magnetospheric plasma with assuming Jovian magnetic field model. The assumed magnetic field model, which is based on the Galileo observation, is characterized by a current sheet-like structure on the dawn side and a dipole-like structure on the dusk side. The current sheet- like magnetic field structure produces a narrower upward FAC region with larger current density than in case of the dipole-like field structure. On the other hand, fast plasma flows confine the upward FAC region without increasing the current density. The asymmetric magnetic field configuration would mainly cause the asymmetric main auroral oval because the asymmetric configuration is present at almost all times, while the fast plasma flows, which are observed periodically (2-3 days), would contribute to the formation of the asymmetric main oval additionally. Our results show that the upward FAC flowing in the fast plasma flow region would relate with the transient auroral structures such as "dawn storm" and "multiple auroral arcs" appearing only in the dawn region.

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