Fig. 4From: MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a reviewElectron densities derived from the DAE and DPE using the Saura HF radar (left panel) and the corresponding signal powers for the ordinary (O mode) and X modes obtained using interleaved observations (right panel) (after Singer et al. 2003)Back to article page