The correlations of ions density with geomagnetic activity and solar dynamic pressure in cusp region
Dandouras, I.; Lucek, E.; Reme, H.; Fazakerley, A.; Guo, JianGuang; Zhang, TieLong; Liu, ZhenXing; Shi, JinKui
China, Austria, United Kingdom, France
Abstract
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 during the summer and fall of 2001-2003. The main results are that: (1) O+ ion density responds in a significant way to geomagnetic index Kp, and He+ ion density is not correlated with geomagnetic index Kp, both of them have a significant positive correlation with solar wind dynamic pressure; (2) H+ ion density is also observed to increase with solar wind dynamic pressure, and not correlated with geomagnetic index Kp.