MEAN WINDS AND TIDAL COMPONENTS DURING COUNTER ELECTROJET EVENTS

The first observations of mean winds and the amplitude and phases of t he tidal components measured with a meteor wind radar located at Triva ndrum (8.5-degrees-N, 77-degrees-E) during five consecutive days of co unter electrojet events identified in the horizontal component of the earth's magnetic field from January 27-31, 1987 are described. The mea n zonal winds in the altitude region of 90-105 km are in general westw ard during counter electrojet days and eastward during no counter elec trojet days. The amplitudes and phases of the tidal components on the counter electrojet days are found to be substantially different from t hose on the no counter electrojet days.