Instruments:sdt

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Forbes/Vial Solar Semidiurnal Tides

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Description of Instrument/Model

These are the results of model runs at 170 altitudes between 0 and 110 km at every 2 degrees of latitude between -88 and +88. We give the semidiurnal amplitude and phase of the eastward neutral wind, the northward neutral wind, the neutral temperature, and the geopotential. The results are independent of solar cycle, so the year is arbitrary. The year 1988 was chosen because this was the year that the model runs were made. The calculations were done for each month of the year (on the 15th day of the month). Some temperature amplitudes are shown as 0 near the pole but with some phase. This is the result of truncation with amplitudes less than 0.005 K.

These semidiurnal tides were updated by the GSWM solar semidiurnal tides in the CEDAR Data Base as gsw and reported in Hagan et al (1995a,b).

The summary plots show the amplitudes of the semidiurnal solar tides in the eastward wind, the northward wind, the neutral temperature, and the geopotential.

References

Forbes J.M. and Vial F., Monthly simulations of the solar semidiurnal tide in the Mesosphere and Lower Thermosphere J. Atmos. Terr. Phys., 51, 649-661,1989.
Hagan, M.E., J. M. Forbes, and F. Vial, On modeling migrating solar tides, Geophys. Res. Lett., 22, 893-896, 1995a.
Hagan, M.E., J. M. Forbes, and F. Vial, An updated model of migrating tides in the middle atmosphere: Initial results and measurement comparisons, Proceedings of the Workshop on Wind Observations in the Middle Atmosphere, CNES HQ, Paris France, 1995b.


Summary Plots for the Forbes/Vial Semidiurnal Solar Tides

Newer semidiurnal solar tides

Semidiurnal lunar tides


-Revised 19 May 2000 by Barbara Emery