Relação entre MTM (Midnight Temperature Maximum) e altura virtual da camada F.

Abstract

Thermospheric wind and temperature have been observed by two OI630 nm Fabry- Perot Interpherometers installed at Sao Joao do Cariri (7.4 ° S, 36.5 ° W) and Cajazeiras (6.9 ° S, 38.6 ° W), Paraiba. In the present work, we have also used Digisonda data from Euzebio (3.9 ° S, 38.4 0 W), Ceara and CADI (Canadian Advanced Digital lonosonde) inform Sao Joao Cariri. The database (wind, intensity, temperature, and bottomside height of the F layer were obtained during 2011, whose the solar activity was moderate and solar flux were between 90 and ~ 155 10~22W I m21 Hz In the evening, the meridional wind presented a magnitude of ~ 70 m/s in both solstices, but the flow direction was different. The wind was poleward during the winter and equatorward during the summer, this behavior is the key to the MTM (Midnight Temperature Maximum). The relation among the bottomside of the F layer, the zonal wind and the MTM, will be discussed in this work as well.