Fig. 5From: The swarm Langmuir probe ion drift, density and effective mass (SLIDEM) productYear-long plot of effective ion mass for Swarm A for the year 2018, for IRI-2016 a and SLIDEM (b). The colorbar is inverted, i.e., red colours denote periods of lower effective ion mass. The y-axis is quasi-dipole latitude. The dashed lines delineate the periods of validity, since significant along-track ion drifts are expected to be present at higher latitudesBack to article page