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1996年10月10日至11月29日在地磁北纬29．6°附近（L=1．3）的新疆喀什、甘肃安西和北京，沿东西方向建立了地磁脉动观测台链．根据观测数据，研究了低纬Pi2脉动东西方向的传播特性和偏振特性，发现黄昏区以东向传播的右旋偏振为主，2000LT以后逐渐转为以西向传播的左转偏振为主，在2230LT有一个传播方向的突变．整个夜间偏振主轴方向基本以0000LT为界，0000LT前以NE－SW方向为主，0000LT后以NW－SE方向为主．
From October 10 to November 29, 1996, in Kashgar, Xinjiang, Anxi and Gansu, at an angle of 29.6 ° N at latitude north (L = 1.3), a geomagnetic pulsation observation chain was established along the east-west direction. Based on the observed data, the propagation characteristics and polarization characteristics of the pulsating east-west direction of Pi2 at low latitudes are studied. The dominant dextrorotatory polarization propagates eastward in the dusk region and the left-handed polarization propagates westward after 2000LT. At 2230LT There is a mutation in the direction of transmission. The direction of polarization principal axis is basically 0000LT for the whole night, and NE-SW direction is the main one before 0000LT, while NW-SE direction is the main one after 0000LT.