Prompt Response of the Dayside Magnetosphere to Discrete Structures Within the Sheath Region of a Coronal Mass Ejection

作     者：Blum, L. W. Koval, A. Richardson, I. G. Wilson, L. B. Malaspina, D. Greeley, A. Jaynes, A. N. 

作者机构：CU Boulder Dept Astrophys & Planetary Sci Boulder CO 80309 USA CU Boulder Lab Atmospher & Space Phys Boulder CO 80309 USA NASA Goddard Space Flight Ctr Greenbelt MD USA Univ Maryland Baltimore Cty Baltimore MD 21228 USA Univ Maryland Dept Astron College Pk MD 20742 USA Univ Iowa Dept Phys & Astron Iowa City IA 52242 USA 

出 版 物：《GEOPHYSICAL RESEARCH LETTERS》 (地球物理学研究快报)

年 卷 期：2021年第48卷第11期

页      面：e2021GL092700-e2021GL092700页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：NASA Heliophysics Guest Investigator Program [80NSSC21K0087] Wind MODA funds 

主　　题：dayside magnetosphere EMIC waves ICME sheath radiation belts solar wind 

摘      要：A sequence of discrete solar wind structures within the sheath region of an interplanetary coronal mass ejection on November 6, 2015, caused a series of compressions and releases of the dayside magnetosphere. Each compression resulted in a brief adiabatic enhancement of ions (electrons) driving bursts of electromagnetic ion cyclotron (EMIC;whistler mode chorus) wave growth across the dayside magnetosphere. Fine-structured rising tones were observed in the EMIC wave bursts, resulting in nonlinear scattering of relativistic electrons in the outer radiation belt. Multipoint observations allow us to study the spatial structure and evolution of these sheath structures as they propagate Earthward from L1 as well as the spatio-temporal characteristics of the magnetospheric response. This event highlights the importance of fine-scale solar wind structure, in particular within complex sheath regions, in driving dayside phenomena within the inner magnetosphere.