Ionosonde observations at King George Island, Antarctica: 1986-1991

The ionospheric phenomena related to tropospheric forcing such as atmospheric gravity waves, are also of significant interest since the Antarctic Peninsula may be considered as a long (thousand km) and high (2 km mean height) barrier to the prevailing and strong westerly winds, being almost perpendicular to the barrier.To better assess some of the above indicated characteristics and phenomena, a project was developed which would need the latitudinal extension of available ionospheric observations for many years at Argentine Islands (S65, W64), Port Stanley (S52, W58) and Halley Bay (S76, W27). In particular, the scientific questions raised and partial results obtained from the data base presented here are (a) thermospheric irregularities , thermospheric winds and Sporadic Es.