Fig. 1From: Longitudinal structure in electron density at mid-latitudes: upward-propagating tidal effectsLongitudinal and magnetic local time variations of the residual electron density (\(\Delta Ne\)) observed by CHAMP (top) and simulated by TIEGCM (bottom) without tidal inputs at the low boundary. Densities are given in \(10^{10}\,\mathrm{m}^{-3}\). Left column is in the Northern Hemisphere and right in the Southern HemisphereBack to article page