While we are most familiar with the Earth's aurora, the giant planets of the solar system exhibit similar phenomena. Jupiter has three distinct regions of aurora; the Io spot and tail, main oval, and variable polar aurora. The main aurora is caused by an internally driven, steady-state process and is direction connected with the transfer of angular momentum from Jupiter to radially transported Iogenic plasma. I will show that field-aligned potentials are crucial in the transport of angular momentum from Jupiter's atmosphere to its magnetospheric plasma.