Tidal activity in the middle atmosphere

The terdiurnal tide in the mesosphere and lower thermosphere over Wuhan (30°N, 114°E)

“…However the phase variations in summer can be explained by a nonlinear interaction between the diurnal and semidiurnal tides (Glass and Fellous, 1975;Teitelbaum et al, 1989). At some certain times, the observed short-term terdiurnal tidal amplitudes are correlated to those of the diurnal and semidiurnal tides, and its vertical wave number is equal to the sum of the vertical wave numbers of the diurnal and semidiurnal tides (Cevolani, 1987;Thayaparan, 1997;Younger et al, 2002), which supports the interpretation of nonlinear interaction. Furthermore, some researchers presented that interactions between the diurnal tide and gravity waves can also produce near 8-hour and 12-hour oscillations (Miyahara and Forbes, 1991;Thayaparan et al, 1995).…”

“…summer was not consistent with solar driven modes (Glass and Fellous, 1975;Manson and Meek, 1986;Cevolani, 1987;Teitelbaum et al, 1989). However the phase variations in summer can be explained by a nonlinear interaction between the diurnal and semidiurnal tides (Glass and Fellous, 1975;Teitelbaum et al, 1989).…”

“…However, there are still very limited studies on the terdiurnal (8-hour) tide in the MLT region, partly because of the relatively small amplitude of the terdiurnal tide compared to the diurnal and semidiurnal ones, as generally expected. However, some workers have shown that the amplitude of the terdiurnal tide is often comparable to that of the diurnal and/or the semidiurnal tides (Manson and Meek, 1986;Cevolani, 1987;Reddi et al, 1993;Teitelbaum et al, 1989). Midlatitude observations suggest that the amplitude of the terdiurnal tide is largest in winter or near winter months (Manson and Meek, 1986;Teitelbaum et al, 1989;Thayaparan, 1997;Smith, 2000;Namboothiri et al, 2004).…”

MF radar observations of terdiurnal tide in the mesosphere and lower thermosphere at Wakkanai , Japan

“…The terdiurnal tide was ÿrst reported by Revah (1967) using meteor radar observations at Garchy (47 • N; 3 • E). Later on, reports based on both meteor and medium frequency (MF) radar observations at a few stations gave more information on the general characteristics of the terdiurnal tide (e.g., Glass and Spizzichino, 1974;Cevolani and Bonelli, 1985;Manson and Meek, 1986;Cevolani, 1987;Teitelbaum et al, 1989;Reddi et al, 1993). Seasonal patterns for the northern midlatitudes suggest that the terdiurnal tide reaches its maximum amplitude during the winter.…”

Latitudinal variations of neutral wind structures in the lower thermosphere for the March equinox period

“…Cevolani and Bonelli, 1985;Manson and Meek, 1986;Smith, 2000). This wave can be interpreted both as the solar driven terdiurnal tide and as the result of the wave-wave interactions between the diurnal and semidiurnal tides (Glass and Fellous, 1975;Smith, 2000).…”