PROPAGATION CHARACTERISTICS OF THE Pc3 FREQUENCY RANGE PULSATION IN THE CUSP LATITUDES

WT5BZ] Two induction magnetometers have been installed at Zhongshan and Davis Stations, Antarctica respectively. We adopt with cross spectral analysis technique to analyze the data of the two induction magnetometers, in June, September, December 1996 and March 1997, to investigate the Pc3 frequency range pulsation occurrence and propagation characteristics in the cusp latitudes. The results are summarized as following: At Zhongshan Davis Station, the Pc3 frequency range pulsation occurs mainly around the local noon/ local magnetic noon and local magnetic midnight respectively. In daytime, the pulsation has a seasonal variation in amplitude, occurrence and temporal range, all of them are smallest in winter. But in nighttime, the pulsation has no such a variation. The pulsation amplitude is much larger in nighttime than in daytime all over the year. The pulsation propagating direction is mainly western in daytime and irregularly in nighttime. It can be thought that the different sources of the pulsation and the ionospheric electric conductivity are mainly responsible for these characteristics.