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Detailed Reference Information |
Oliver, W.L., Fukao, S., Takami, T., Yamamoto, M., Tsuda, T., Nakamura, T. and Kato, S. (1990). Thermospheric meridional winds measured by the middle and upper atmosphere radar. Journal of Geophysical Research 95: doi: 10.1029/90JA00012. issn: 0148-0227. |
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We use 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, Shiga, Japan, 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. The Mu radar winds are consistent with the majority of other such wind results reported in the literature for other mid-latitude locations concerning the phases and times of wind direction turnings. The amplitudes of the Mu radar winds, however, are generally smaller than the amplitudes reported elsewhere by a factor of 1.5--2. We see no trace of an abatement in the southward wind at midnight as seen at lower latitudes or of large winds exceeding 200 m/s in the nighttime as reported for locations near the polar regions. ¿ American Geophysical Union 1990 |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Thermospheric dynamics |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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