Physics – Plasma Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523101m&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 23, CiteID L23101
Physics
Plasma Physics
12
Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Magnetospheric Physics: Energetic Particles: Trapped
Scientific paper
We show evidence that left-hand polarised electromagnetic ion cyclotron (EMIC) plasma waves can cause the loss of relativistic electrons into the atmosphere. Our unique set of ground and satellite observations shows coincident precipitation of ions with energies of tens of keV and of relativistic electrons into an isolated proton aurora. The coincident precipitation was produced by wave-particle interactions with EMIC waves near the plasmapause. The estimation of pitch angle diffusion coefficients supports that the observed EMIC waves caused coincident precipitation of both ions and relativistic electrons. This study clarifies that ions with energies of tens of keV affect the evolution of relativistic electrons in the radiation belts via cyclotron resonance with EMIC waves, an effect that was first theoretically predicted in the early 1970's.
Albert Jacques
Connors Martin
Evans Dafydd
Jordanova Vania
Miyoshi Yasunobu
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