Observações de oscilações de escala planetária na baixa termosfera equatorial.

Abstract

Thermospheric wind measurements from Fabry-Perot interferometers located at São João do Cariri (7.4°S; 36.5°W) and Cajazeiras (6.9°S; 38.6°W) with both having geomagnetic coordinates (35.8°E; 0.48°N) were investigated for periodicities above 2 days. This was done by using airglow emission of Atomic Oxygen (OI630.0 nm the red line) during the nighttime from 20:00 to 03:00 local time (LT). Lomb–Scargle analysis was used to process the thermospheric winds and temperature. The phases (time of maximum) and amplitudes of these oscillations were estimated by using least square fitting method (LSF). From the result obtained, strong quasi 6-8 days planetary oscillations were observed from the wind measurements 2012 to 2014. A period of 6-days was observed in the meridional and zonal winds, while periods of 8 and 9 days were observed in the intensity and temperature during November 2013. The amplitudes and phases of these oscillations were determined, amplitudes of 30 m/s, 18.6 m/s, 0.88 R and 94.67 K were observed in the meridional and zonal winds, intensity and temperature, respectively. Also the same phase (time of maximum) was observed in the wind measurements.