THE RELATIONSHIP BETWEEN INDICES AE AND D_st

In this paper Data of AEand D_st indices from July 1972 to December 1974 have been analyzed for the correlation between these two indices the correlation coefficient of the data for every half year are between 0.5 and 0.6. As the geomagnetic disturbance level increases, that means when the values of the D_st index decreases the correlation coefficient decreases.Since the D_st index mainly reflect the intensity of the equatorial ring current whereas the AEindex mainly reflect the intensity of the auroral electrojet, the correlation between these two indices may reflect the relationship between these two current systems.The results of the correlative analyses also show that the south-north component of the interplanetary magnetic field have no obvious influence on this relationship.