Mesosphere-thermosphere tidal coupling during the September 21-25, 1987, LTCS 1 campaign

Details Mesosphere-thermosphere tidal coupling during the September 21-25, 1987, LTCS 1 campaign Mesosphere-thermosphere tidal coupling during the September 21-25, 1987, LTCS 1 campaign

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1135f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1135-1145.

Physics

18

Atmospheric General Circulation Models, Atmospheric Tides, Incoherent Scatter Radar, Mesosphere, Thermosphere, Diurnal Variations, Gravity Waves, Lower Atmosphere, Planetary Waves

Scientific paper

The thermosphere is dynamically coupled to the mesosphere and lower atmospheric regions by gravity waves, tides, and planetary waves which propagate upward from below and often undergo dissipation in the 80 to 150-km region. This paper focuses on the mesosphere-thermosphere coupling due to the solar semidiurnal atmospheric tide during the first Lower Thermosphere Coupling Study campaign interval of September 21-25, 1987. During this period, determinations of semidiurnal eastward (u) and northward (v) velocity components and temperature (delta T) are available within the 80 to 150-km region from a total of 13 incoherent scatter, meteor, and spaced antenna radars. A new method is developed and reported here for assimilating such data sets into a self-consistent global empirical description of the tidal dynamics between 80 and 150 km. Using a set of numerically generated "Hough mode extension' (HME) functions for u, v, and delta T corresponding to the (2,2), (2,3), (2,4), and (2,5) semidiurnal tidal modes, a least squares fit to the radar data is performed. The fit results in a single (complex) normalizing factor for each HME from which globally continuous and internally consistent semidiurnal oscillations in u, v, and delta T (as well as vertical velocity and density) can be derived.

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