Figure 3
From: Observations of GPS scintillation during an isolated auroral substorm
σ φ values computed for each satellite shown as a separate time series. The color indicates the PRN number of the satellite, and the grey portions of the lines mean that the elevation angle of the satellite was less than 30° when the signal was received. The scale of the vertical axis has been changed for PRN10, PRN23, and PRN29. The vertical dotted lines indicate the times at which the auroral images in Figure 4 were taken.