Abstract
Observations of night-time thermospheric temperatures from measurements of Doppler widths of the OI 630.0 nm airglow emission line, using a Fabry-Perot interferometer, have been carried out from 23°S geographic latitude in the Brazilian sector, during the period March 1988–October 1989. The observing location is situated inside both the equatorial ionospheric and South Atlantic magnetic anomalies. In this paper we present and discuss salient features of the average nocturnal variations of the thermospheric temperature during equinox and winter seasons. The results are compared with the thermospheric temperatures predicted by the MSIS-86 model. The observed temperatures are in good agreement compared with the MSIS-86 model temperatures. They are comparable with those reported from other low latitude stations and no anomalous high thermospheric temperatures have been observed in this region of the South Atlantic magnetic anomaly.
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