The interval within the geometric wake is shaded, and a vertical line is shown at the wake center. Galileo's trajectory past io in the xy plane. The magnituce of the z component of the field is plotted toward positive x for each point on the trajectory. Schematic flow streamlines illustrate that in regions A1 and A2, the plasma is likely to have flowed by Io from upstream and passed close to Io's surface whereas the plasma in region C within the geometric wake has no direct upstream source in the equatorial plane. R Io ahove Io's surface is indicated by a filled circle.
Open circles indicate key times.
Ion cyclotron waves n the vicinity of lo. The upper trace shows the amplitude near the peak frequency.