Fig. 26From: Swarm Thermal Ion Imager measurement performanceTime series for random error sources estimated using the EES. For each error source, the plot shows errors in ion velocity (top panel), electric field (middle panel) and ion temperature (bottom panel). The dashed lines mark the artificial transition from a noon–midnight orbit to a dawn–dusk orbit. Data have been downsampled by averaging to the Nyquist frequency of 1 HzBack to article page