Multiple‐Satellite Observation of Magnetic Dip Event During the Substorm on 10 October 2013
Abstract
We present a multiple‐satellite observation of the magnetic dip event during the substorm on 10 October 2013. The observation illustrates the temporal and spatial evolution of the magnetic dip and gives a compelling evidence that ring current ions induce the magnetic dip by enhanced plasma beta. The dip moves with the energetic ions in a comparable drift velocity and affects the dynamics of relativistic electrons in the radiation belt. In addition, the magnetic dip provides a favorable condition for the electromagnetic ion cyclotron (EMIC) wave generation based on the linear theory analysis. The calculated proton diffusion coefficients show that the observed EMIC wave can lead to the pitch angle scattering losses of the ring current ions, which in turn partially relax the magnetic dip in the observations. This study enriches our understanding of magnetic dip evolution and demonstrates the important role of the magnetic dip for the coupling of radiation belt and ring current.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 22, 2017
- Source ID
- 10.1002/2017gl074869
Entities
People
- Geoffrey D Reeves
- Hui Zhu
- Lun Xie
- Lunjin Chen
- Ying Xiong
- Yong Cao
- Zhaoguo He
- Zhiyang Xia
Organizations
- Air Force Office of Scientific Research
- China Postdoctoral Science Foundation
- Chinese Academy of Sciences
- Harbin Institute of Technology
- Los Alamos National Laboratory
- National Natural Science Foundation of China
- National Sleep Foundation
- Peking University
- University of Texas at Dallas