Weddell Sea Anomaly: Investigation using the global numerical model

The Weddell Sea Anomaly morphology and the mechanism of its formation were investigated using the global numerical Upper Atmosphere Model (UAM) and the empirical model of the ionosphere IRI-2001. The numerical experiments have showed that the anomalous, inverted diurnal F2-layer electron density variations in the summer Weddell Sea area are caused by the non-coincidence of the geomagnetic and geodetic axes. This non-coincidence produces the difference in vertical velocities of the ion transportation by the thermospheric wind action at western and eastern longitudinal sectors.