Effect of Non-Linear Field-Aligned Potentials on Jupiter's Aurora

Details Effect of Non-Linear Field-Aligned Potentials on Jupiter's Aurora Effect of Non-Linear Field-Aligned Potentials on Jupiter's Aurora

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm23a0295r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM23A-0295

Physics

2756 Planetary Magnetospheres (5443, 5737, 6033), 5706 Aurorae, 5719 Interactions With Particles And Fields, 5737 Magnetospheres (2756), 6220 Jupiter

Scientific paper

Currents couple Jupiter's ionosphere to its equatorial plasma and drive the main auroral oval. The Pederson conductivity, which is estimated to be between .01mho - 1 mho, limits the ionospheric current. Nichols and Cowley (2004) examined how field-aligned currents affected the Pederson conductivity using a linear Knight current-potential relationship. They further investigated the feedback of these field-aligned potentials and found that parallel potential drops did not significantly affect the corotation breakdown point (Nichols and Cowley, 2005) and hence the location of the main aurora. However, Su et al. (2003) states that the linear Knight relation is not applicable for the Io flux tube. We therefore investigate the possibility of Knight saturation in Jupiter's middle magnetosphere and the subsequent role of field-aligned potentials in the non-linear regime. Specifically, we look at a current-voltage relationship determined by the kinetic energy of the current-carrying electrons accelerated by a field-aligned potential, Φ∥ = \frac{mJ∥2}{2n2e3}.

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