Fig. 12From: Longitudinal structure in electron density at mid-latitudes: upward-propagating tidal effectsLongitudinal and magnetic local time variations in the residual electron density (\(\Delta Ne\)) driven by non-wind effects under non-migrating tide condition (top), and the ratio between Oxygen and Nitrogen (\(\Delta O/N_2\)) at 400Â km in both hemispheres (bottom)Back to article page