Observations of EMIC waves over a wide range of magnetic shells by using multi satellite data

It is generally believed that electromagnetic ion cyclotron (EMIC) waves are generated by temperature anisotropy. However, recent statistical studies indicated the high occurrence rate of EMIC waves in the outer magnetosphere, which is sensitive not to the temperature anisotropy, but to the solar wind variations. Our previous studies suggested that the disturbances in the magnetosheath flow can excite broadband EMIC sources in the outer magnetosphere. In this study, we investigate the correlation of EMIC waves over radially inward locations. In order to cover a wide range of L shells from the inner to the outer magnetosphere, we have examined the concurrent data of multi satellites such as Van Allen Probes, GOES, THEMIS and CLUSTER. It is presented how much both inner and outer EMIC wave events are affected by the solar wind and magnetosheath activities and correlated with each other.