Multi-instrument Observation of Nonlinear EMIC-Driven Electron Precipitation at sub–MeV Energies

0507759 - ÚFA 2020 RIV US eng J - Journal Article
Hendry, Aaron - Santolík, Ondřej - Kletzing, C. A. - Rodger, C. J. - Shiokawa, K. - Baishev, D.
Multi-instrument Observation of Nonlinear EMIC-Driven Electron Precipitation at sub–MeV Energies.
Geophysical Research Letters. Roč. 46, č. 13 (2019), s. 7248-7257. ISSN 0094-8276. E-ISSN 1944-8007
Grant - others:AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institutional support: RVO:68378289
Keywords : waves * emissions
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 4.497, year: 2019
Method of publishing: Limited access
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL082401

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.
Permanent Link: http://hdl.handle.net/11104/0298733