Abstract
Equatorial ionosphere sounding at São Luís (2.6 S, 44.2 W) and Fortaleza (3.9 S, 38.4 W), and mesospheric airglow OI5577, O2b(0,1) and OH(6,2) emissions and OH rotational temperature observation at Cariri (7.4 S, 36.5 W) have been carried out since 1999. Spectral analyses of the ionospheric F-layer bottom height (h'F) and mesospheric airglow emission intensities reveal that there are quasi 2 and 4 day period oscillations in their temporal variations. Simultaneously observed meteor wind at 90 km of altitude at Cariri also showed similar periodic oscillations. It might indicate that planetary scale oscillations, Rossby-gravity waves and Ultra Fast Kelvin waves, are present in the ionosphere, passing through the mesosphere.
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