Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..285g&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 3, p. 285-295
Mathematics
Logic
35
Anisotropy, Climatology, Gravity Waves, Middle Atmosphere, Wave Propagation, Wind Variations, Data Reduction, Geomagnetism, Perturbation, Solar Radio Emission, Wind Direction, Wind Velocity
Scientific paper
Saskatoon (52 deg N, 107 deg W) medium frequency (MF) radar data from 1979 to 1993 have been analyzed to investigate the climatology of irregular wind components in the height region 60-100 km. This component is usually treated in terms of internal gravity waves (IGW). Three different band-pass filters have been used to separate the intensities of IGWs having periods 0.2-2.5; 1.5-6 and 2-10 h, respectively. Height, seasonal and inter-annual variations of IGW intensties, anisotropy and predominant directions of propagation are investigated. Mean over 14 years' seasonal variation of the intensity of long-period IGWs shows a dominant annual component with winter maximum and summer minimum. Seasonal variations of the intensity of short-period waves have a strong semiannual component as well, which forms a secondary maximum in summer. Predominant azimuths of long-period IGWs are generally zonal, though they vary with season. For short-period IGWs, the predominant azimuth is closer to the meridional direction. Anisotropy of IGW intensity is larger in summer, winter and at lower altitudes. The IGW intensity shows apparent correlation with both solar and geomagnetic activity. In most cases, this correlation appears to be negative. The variations versus solar activity is larger for longer-period IGW. Possible reasons and consequences of the observed climatological variations of IGW intensity are discussed.
Gavrilov Nikolai M.
Manson Alan H.
Meek Chris E.
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