Cr. Reddi et G. Ramkumar, LONG-PERIOD WIND OSCILLATIONS IN THE METEOR REGION OVER TRIVANDRUM (8-DEGREES-N, 77-DEGREES-E), Journal of atmospheric and terrestrial physics, 57(1), 1995, pp. 1-12
The spectra of long period wind oscillations in the meteor zone over T
rivandrum are presented. The spectral amplitudes were found to be much
larger during June 1984 when the QBO in the stratospheric zonal wind
was in a strong easterly phase compared with June 1987 when the zonal
winds at the altitude of maximum QBO were weak westerlies. Zonal wind
amplitudes for periods of 15 and 5 days were found to be most signific
ant during these two June months. The amplitudes of these two oscillat
ions in meridional wind were found to be as large as the amplitudes in
the zonal wind. The vertical wavelength in both zonal wind and meridi
onal winds of the 15-day oscillation is very large whereas for the 5-d
ay oscillation the vertical wavelengths were 80 and 65 km during June
1984 and June 1987, respectively. The results are discussed.