Model electric field based on observations and an assumed solar wind electric field. Blue lines show the model results; red lines show a 1000 data points running mean of the same data. Upper panel: magnitude of the model electric field. Middle panel: angle of the net model electric field from anti-sunward. Lower panel: Sun distance [AU] as a blue line, scale to the left, cometocentric distance [km] as a red line, scale to the right.