Fig. 2
From: Light ion dynamics in the topside ionosphere and plasmasphere during geomagnetic storms
Superposed epoch analysis of dayside effective ion mass (left) and density (right) for Swarm A (top), C (middle) and B (bottom), for the years specified in the panel titles. a, c and e show the effective ion mass for Swarm A, Swarm C and Swarm B respectively, while b, d and f show the ion density for the same spacecraft. The plots show the median values (red), while error bars denote the upper and lower quartiles. Blue solid curves denote the median Dst index (with an inverted scale to the right), while blue dashed curves denote the 25% and 75% quantiles