Thermospheric meridional winds measured by the middle and upper atmosphere radar

Details Thermospheric meridional winds measured by the middle and upper atmosphere radar Thermospheric meridional winds measured by the middle and upper atmosphere radar

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7683o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7683-7692. Research supported by Japan Society for t

Computer Science

Sound

28

Atmospheric Circulation, Ionospheric Electron Density, Radar Measurement, Thermosphere, Wind Velocity Measurement, Annual Variations, Atmospheric Sounding, Diurnal Variations, Incoherent Scatter Radar

Scientific paper

Full-year and seasonal averages of F region electron density and ion velocity measurements made by the Japanese middle and upper atmosphere (MU) radar in Shigaraki were used to compute the neutral meridional winds for this location. The average winds are highly diurnal in nature. The all-year average winds are poleward by day and equatorward by night. Maximum daytime winds are reached near 10 LT, and maximum nighttime winds are reached at midnight. This is consistent with the accepted picture of global circulation consisting of winds driven basically around the earth from the dayside subsolar point toward the nightside antisubsolar point. Dependence on ion drag is seen in the form of larger nighttime winds and the prenoon daytime velocity maximum. In winter, the winds are strongly northward for the entire daylight period, while in the summer the winds become northward for only a few hours before noon and then turn southward for the remainder of the day.

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