In order to extend both theoretical and experimental investigations of low-latitude Pc 3 magnetic pulsations, we conducted conjugate magnetic observations at Asahikawa (ASH; &lgr;=142.2¿, ϕ=43.93¿, L=1.55) and Onagawa (ONW; 141.48¿, 38.43¿, 1.30) in Japan and Birdsville (BSV; 139.3¿, -25.83¿, 1.55), i.e., the conjugate point of ASH, Dalby (DAL; 151.2¿, -27.18¿, 1.56) and St. Kilda (SKD; 138.5¿, -34.7¿, 2.11) in Australia, during the period from July 20 to September 16, 1986. From the analysis of these conjugate-area date, occurrence and polarization characteristics of low-latitude Pc 3 pulsations can be summarized as follows: (1) The averae amplitude at SKD (L=2.1) is about twice that at BSV (1.55). (2) The H component amplitude at BSV in the winter hemisphere is larger than that at ASH in the summer hemisphere. (3) The polarizations at all stations switch statistically from left-handed in the morning to right-handed in the afternoon, where polarization senses are defined with reference to the direction of the main geomagnetic field. (4) However, the switch from L-H to R-H polarization at the conjugate stations (L=1.55) does not always occur near local noon, but sometimes near 0500 and 1700 LT. (5) The abrupt changes of major axis orientations of Pc 3 polarization ellipses appear to coincide with the ionospheric conductivity enhancement and depression, respectively, associated with local sunrise and sunset. These observational facts suggest that standing field line resonance in the Pc 3 frequency range is situated at L>2.1, and that at lower latitudes (L≲1.5) Pc 3 magnetic pulsations could arise predominantly from compressional mode waves propagating transverse to the Earth's magnetic field through the low-latitude ionosphere. ¿ American Geophysical Union 1988