Supported by the National Natural Science Foundation of China (Grant Nos. 40621003, 40674091 and 40523006);the International Collaboration Research Team Program of the Chinese Academy of Sciences
A statistical study of the properties of ions (O+, He+ and H+) measured by the Cluster-II in cusp region as a function of the solar wind dynamic pressure and geomagnetic index Kp respectively was made dur-ing the summ...