低纬Pc3地磁脉动的东西方向传播特性

PROPAGATION CHARACTERISTICS OF LOW-LATITUDE Pc3 PULSATIONS IN EAST-WEST DIRECTION

１９９６年１０月１０日至１１月２９日在地磁北纬２９．６°附近（Ｌ＝１．３）的喀什、安西和北京，沿东西方向建立了横跨４０．２°地理经度的地磁脉动观测台链．根据观测数据，分析研究了低纬Ｐｃ３脉动东西方向的传播特性和偏振特性．结论是上午以向西传播为主，下午以向东传播为主．白天偏振椭圆主轴方位方向以ＮＷ－ＳＥ为主，偏振方向以右旋为主．

An east-west chain of three stations was established in north china near geomagnetic latitude 29.6° (L = 1.3) within a geomagnetic longitude span of 40.2° from Oct. 10 to Nov. 29 in 1996. Propagation and polarization characteristics of low-latitude Pc3 pulsations were studied. It is concluded that the westward propagation of Pc3 pulsations is dominant in the morning and the eastward propagation is dominant in the afternoon. NW-SE of major axis azimuth and right-handed polarization are dominant in the daytime.