Abstract
Ionospheric vertical sounding observations, using the Canadian Advanced Digital Ionosonde (CADI), are being carried out at Sao Jose dos Campos (23°S), Brazil, under the southern crest of the Equatorial Ionization Anomaly (EIA) region since August 2000. In this paper we present and discuss some important features of observations carried out from September 2000 to August 2001 and from January 2006 to December 2006. This is a period of high solar activity and low solar activity respectively, and observations during both quiet and disturbed geomagnetic conditions are presented. In this investigation, strong wave-like structures propagating through the F-layer during the daytime and nighttime, especially in summer, were obtained. The observed wave structures during the daytime are consistent with the linear theory of gravity waves, having periods of about 30 to 90 minutes. The vertical variations in F-layer plasma density profiles caused by gravity waves were sometimes so intense that additional F3-layer were formed during the daytime.
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