Journal article
Multi-instrument Observation of Nonlinear EMIC-Driven Electron Precipitation at sub-MeV Energies
Geophysical research letters, Vol.46(13), pp.7248-7257
07/16/2019
DOI: 10.1029/2019GL082401
Abstract
In recent years, experimental results have consistently shown evidence of electromagnetic ion cyclotron (EMIC) wave-driven electron precipitation down to energies as low as hundreds of keV. However, this is at odds with the limits expected from quasi-linear theory. Recent analysis using nonlinear theory has suggested energy limits as low as hundreds of keV, consistent with the experimental results, although to date this has not been experimentally verified. In this study, we present concurrent observations from Polar-orbiting Operational Environmental Satellite, Radiation Belt Storm Probes, Global Positioning System, and ground-based instruments, showing concurrent EMIC waves and sub-MeV electron precipitation, and a global dropout in electron flux. We show through test particle simulation that the observed waves are capable of scattering electrons as low as hundreds of keV into the loss cone through nonlinear trapping, consistent with the experimentally observed electron precipitation.
Details
- Title: Subtitle
- Multi-instrument Observation of Nonlinear EMIC-Driven Electron Precipitation at sub-MeV Energies
- Creators
- A. T. Hendry - Czech Academy of Sciences, Institute of Atmospheric PhysicsO. Santolik - Charles UniversityC. A. Kletzing - University of IowaC. J. Rodger - University of OtagoK. Shiokawa - Nagoya UniversityD. Baishev - Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.46(13), pp.7248-7257
- Publisher
- Amer Geophysical Union
- DOI
- 10.1029/2019GL082401
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 10
- Grant note
- Praemium Academiae award Ministry of Science and Higher Education of the Russian Federation AAAA-A17-117021450059-3 / Siberian Branch of the Russian Academy of Sciences; Russian Academy of Sciences 25247080; 16H06286 / JSPS KAKENHI; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) NAS5-01072 / Energetic Particle, Composition, and Thermal Plasma (RBSP ECT) investigation under NASA's Prime contract postdoctoral program of the Czech Academy of Sciences NAS5-01072; 921647 / JHU/APL under NASA Prime contract
- Language
- English
- Date published
- 07/16/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429052302771
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