Planetary Waves in the Lower Ionosphere Over the Mid-and Low Latitude Regions in China

In this paper,spectra of observed ionospheric absorption data of radio waves for five years were analysed and its comparison with events of stratospheric warmings was made.Some preliminary conclusions of the results are: (1) the effects of stratospheric warming in polar regions on the mid-and low latitudes absorption through planetary wave propagation take 5 to 9 days;(2) in winter,the meridional velocity of planetary wave is between 10 m/s and 15m/s;(3) planetary waves at periods of 32,18,10,8 and 2 days appear for any seasons of the year.They affect the coefficient of atmospheric turbulences.A calculation showed that the deviation of NO density in the mesosphere from its original value by planetary disturbances can be up to 40%.