【摘要】：正A statistical study of the occurrence characteristic of GPS ionospheric scintillation and irregularity in the polar latitude is presented.These measurements were made at Ny-Alesund,Svalbard[78.9°N,11.9°E;75.8°N corrected geomagnetic latitude(CGMLat)]and Larsemann Hills,East Antarctica(69.4°S,76.4°E;74.6°S CGMLat) during 2007-2008.It is found that the GPS phase scintillation and irregularity activity mainly takes place in the months 10,11 and 12 at Ny-Alesund,and in the months 5, 6 at Larsemann Hills.The seasonal pattern of phase scintillation with respect to the station indicates that the GPS phase scintillation occurrence is a local winter phenomenon, which shows consistent results with past studies of 250 MHz satellite beacon measurements.The occurrence rates of GPS amplitude scintillation at the two stations are below 1%.A comparison with the interplanetary magnetic field(IMF) B_y and B_z components shows that the phase scintillation occurrence level is higher during the period from later afternoon to sunset(16-19 h) at Ny-Alesund, and from sunset to pre-midnight(18-23 h) at Larsemann Hills for negative IMF components.The findings seem to indicate that the dependence of scintillation and irregularity occurrence on geomagnetic activity appears to be associated ith the magnetic local time(MLT).