SM43B-4273:
Statistical Character of Emic Waves: Van Allen Probe Observations
Thursday, 18 December 2014
Dedong Wang, Xiongdong Yu, Zhigang Yuan, Xiaohua Deng and Shiyong Huang, Wuhan University, Wuhan, Hubei, China
Abstract:
Electromagnetic Ion Cyclotron (EMIC) waves are believed to be important in the dynamic of inner magnetosphere, for example, in the evolution of ring current ions and radiation belts electrons. Therefore, it becomes important to realize the character of the EMIC waves in the inner magnetosphere. In the previous statistical studies about EMIC waves, the spacecrafts spend limited time in the inner magnetosphere. In contrast, Van Allen Probes spend all their time below the geosynchronous orbit, which provides a good condition to study the statistical character of the EMIC waves in the inner magnetosphere. Utilizing the data of EMFISIS instrument onboard the Van Allen Probe A from Sep 2012 to April 2014, we obtain the statistical character of EMIC waves in the inner magnetosphere. We have also investigated the occurrence rate of the three different bands of EMIC waves: hydrogen band EMIC waves, helium band EMIC waves and oxygen band EMIC waves.
