Numerical simulation of the equatorial wind jet in the thermosphere

Details Numerical simulation of the equatorial wind jet in the thermosphere Numerical simulation of the equatorial wind jet in the thermosphere

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11703309m&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A3, CiteID A03309

Physics

Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Ionosphere: Ionosphere/Atmosphere Interactions (0335), Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

We have examined excitation mechanism of the fast jet of the neutral atmosphere along the dip equator in the upper thermosphere. The zonal momentum balance of the neutral atmosphere is estimated using an atmosphere-ionosphere coupled model. The coupled model used in this study is a self-consistent global model of the atmosphere and ionosphere covering the height range from the ground surface to the exobase. It can reproduce the observed equatorial fast jet above 250 km heights. The analysis of the zonal momentum balance reveals that the pressure gradient and ion drag play an important role on the formation of the fast jet near the dip equator. In particular, the fast jet near the equator is closely related with the latitudinal difference of the ion drag force. We also investigate the zonal momentum balance of the longitudinal wave-4 structure of the zonal wind in the fixed local time frame. Furthermore, significant day-to-day variations in the neutral zonal wind and the ion drift near the dip equator are obtained although the solar UV/EUV fluxes and the energy input from the magnetosphere are assumed to be constant during the numerical simulation. This result indicates the importance of the lower atmospheric variability on day-to-day variations in the thermosphere/ionosphere.

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