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STUDY OF IONOSPHERIC GRAVITY WAVE DISTURBANCES FROM DRIFT MEASUREMENTS OF A DIGISONDE

WAN WEI-XING Li JUN(Wuhan Institute of Physics, Academia Sinica; Wuhan 430071, P. R. China)ZHANG ZHAO-MING B. W. REINISCH(Center for Atmospheric Research University of Lowell, 450 Aiken St. Massachusetts, Ma. 01854, USA)  
The present work studies the large scale ionospheric disturbances such as gravity waves from the drift data of a digisonde,which are usually used in the investigation of drift motion of small scale ionospheric irregularities.An analysis method is developed to obtain Doppler frequency shifts and angles of arrival of radio echoes,and to estimate the horizontal velocity and azimuth angle of propagation of the ionospheric gravity wave dismbances.In this method the MEM dynamic spectral technique is adopted to separate each unique gravity wave field from the observed disturbances.The examples of analysis with drift data of Millstone Hill Station reveal some interesting phenomena such as spectral evolution and the diurnal variation of the horizontal propagation of ionospheric disturbances,which indicate that the present method is useful in the experimental investigation of ionospheric dynamics.
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