SM037-13
The Role of Injected Ring Current Ions in Generating EMIC Waves and Scattering Radiation Belt Particles

Monday, 14 December 2020: 19:36
Virtual
Hyomin Kim1, Sungjun Noh2, Ilya Kuzichev3, Lauren W Blum4, Andrew J Gerrard3, Louis J Lanzerotti5, Marc Lessard6, Mark J. Engebretson7, Sylwia Anna Janiak8 and Dae-Young Lee9, (1)New Jersey Institute of Technology, Center for Solar-Terrestrial Research, Edison, NJ, United States, (2)New Jersey Institute of Technology, Edison, United States, (3)New Jersey Institute of Technology, Center for Solar-Terrestrial Research, Newark, NJ, United States, (4)University of Colorado Bouler, LASP, Boulder, CO, United States, (5)New Jersey Inst Tech, Newark, NJ, United States, (6)University of New Hampshire, Durham, NH, United States, (7)Augsburg University, Physics, Minneapolis, MN, United States, (8)New Jersey Institute of Technology, Newark, NJ, United States, (9)Chungbuk National University, Cheongju, Korea, Republic of (South)
Abstract:
We report on observations of electromagnetic ion cyclotron (EMIC) waves and their interactions with injected ring current particles. A statistical survey of EMIC wave occurrences has been conducted using field (EMFISIS) and particle (HOPE and RBSPICE) data from the Van Allen Probes spacecraft over the entire mission period (September 2012 to July 2019). Approximately 10% of the entire set of EMIC waves were generated or modulated during ring current ion injection events identified by Van Allen Probes proton flux data. Injection-associated EMIC waves occurred predominantly over the noon to dusk sectors and peak occurrences coincided with where the plasmaspheric plume is most likely to be found. The particle data from the spacecraft positioned in the heart of the ring current system present complex, energy-dependent hot proton anisotropy variations during most of the injection-associated EMIC waves. In this study, we consider anisotropy conditions, plasma beta, energetic heavy ion density and growth rates for the injection-associated EMIC waves to understand the role of injected ring current ions in generating EMIC waves and scattering radiation belt particles.
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