PROPAGATION CHARACTERISTICS OF LOW-LATITUDE Pi2 PULSATIONS IN EAST-WEST DIRECTION

An array of three low-latitude pulsation stations was established at Kashi, Anxi and Beijing near geomagnetic latitude 29.6°N (L = 1.3) from Oct. 10 to Nov. 29 in 1996. According to observation data, propagation and polarization characteristics of low-latitude Pi2 pulsations are studied. It is found that eastward propagation with right-handed polarization is dominant in dusk, westward propagation with left-handed polarization are dominant after 2000LT. There is a sudden change of propagation at 2230LT. 0000LT (midnight) is a demarcation line of major axes azimuth basically. NE-SWare dominant before the midnight. NW-SE are dominant after the midnight.