Propagation characteristics of Pc 5 frequency range pulsation at cusp latitude

Magnetic pulsations in the Pc 5 band (150-600 s) are often considered as a result of the interaction between the solar wind and magnetosphere at the magnetopause via the K-H instability. Comparing data between dawn and dusk, asymmetry in the Pc 5 occurrence exists. Rostoker and Sullivan (1987) investigated the polarization characteristics and found that the Pc 5 polarization in the afternoon is inconsistent with K-H instability theory. They suggested that another origination mechanism for Pc 5 pulsations in the afternoon. Both the Chinese Zhongshan Station and Australian Davis Station are located at cusp latitudes. Two induction magnetometers were installed successfully in Jan. 1996 at Zhongshan, Antarctica and earlier at Davis Station. The time accuracy between the two magnetometers can reach 1 ms through the advance embedding time board and the GPS receiving system. Here we adopt the cross-spectral analysis technique, analyze the data obtained by the two induction magnetometers in the Pc 5 frequency band and present the results.