Signatures of Ultrarelativistic Electron Loss in the Heart of the Outer Radiation Belt Measured by Van Allen Probes

TitleSignatures of Ultrarelativistic Electron Loss in the Heart of the Outer Radiation Belt Measured by Van Allen Probes
Publication TypeJournal Article
Year of Publication2017
AuthorsAseev, NA, Shprits, YY, Drozdov, AY, Kellerman, AC, Usanova, ME, Wang, D, Zhelavskaya, IS
JournalJournal of Geophysical Research: Space Physics
Date Published09/2017
Keywordselectron loss; EMIC waves; Radiation belts; ultrarelativistic electrons; Van Allen Probes; wave-particle interactions
AbstractUp until recently, signatures of the ultrarelativistic electron loss driven by electromagnetic ion cyclotron (EMIC) waves in the Earth's outer radiation belt have been limited to direct or indirect measurements of electron precipitation or the narrowing of normalized pitch angle distributions in the heart of the belt. In this study, we demonstrate additional observational evidence of ultrarelativistic electron loss that can be driven by resonant interaction with EMIC waves. We analyzed the profiles derived from Van Allen Probe particle data as a function of time and three adiabatic invariants between 9 October and 29 November 2012. New local minimums in the profiles are accompanied by the narrowing of normalized pitch angle distributions and ground-based detection of EMIC waves. Such a correlation may be indicative of ultrarelativistic electron precipitation into the Earth's atmosphere caused by resonance with EMIC waves.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA024485/full
DOI10.1002/2017JA024485
Short TitleJ. Geophys. Res. Space Physics


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