Fig. 3From: The swarm Langmuir probe ion drift, density and effective mass (SLIDEM) productStatistical analysis of the residual of density estimates between SLIDEM (IDM) and IRI-2016, as well as Level1b and IRI, for the time period 1–30 January 2018. Gaps in (a) denote periods of missing SLIDEM data coverage. Residuals are in units of percentage of the total densityBack to article page