Seasonal variations of equatorial night-time thermospheric meridional winds |
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| Institution: | 1. Department of Chemistry, Smith College, Northampton, MA 01063, USA;2. Chemistry Department, Trinity Washington University, Washington, DC 20017, USA;1. Electrical Engineering Department, Guangxi University, Nanning 530004, China;2. Shantou Power System Group Corporation, Shantou 515000, Guangdong, China;1. CETESB—Companhia Ambiental de São Paulo, Av. Prof. Frederico Hermann Jr., 345, CEP 05459-900 São Paulo, SP, Brazil;2. Instituto de Botânica, CP 3005, CEP 01031-970 São Paulo, SP, Brazil;3. Universidade de São Paulo, Instituto de Biociências, CP 11461, CEP 05422-970 São Paulo, SP, Brazil;1. Norwegian University of Science and Technology (NTNU), Trondheim, Norway;2. Birkeland Centre for Space Science, Bergen, Norway |
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| Abstract: | Using h'F data at two equatorial stations, night-time equatorial thermospheric meridional winds have been deduced for a period of two years to study their seasonal characteristics. It has been found that the thermospheric wind shows trans-equatorial flow from summer to winter hemisphere. During equinoxes the flow is mainly equatorward with a reversal to poleward direction around midnight hours. The abatement and reversal of equatorward wind which is weaker in summer compared to equinoxes is attributed to Midnight Temperature Maximum (MTM). The results of the present investigation are compared with those at other equatorial stations and also with the empirical model of Hedin et al. (1991). |
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