Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13e..05m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13E-05
Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [2778] Magnetospheric Physics / Ring Current
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 at Athabasca, Canada shows coincident precipitation of ring current ions with energies of tens of keV and of relativistic electrons from the outer belt into an isolated proton aurora associated with the EMIC waves. On the other hand, there were no precipitation of electrons below a few hundred keV. The coincident precipitation of low energy ions and energetic electrons was produced by wave-particle interactions with EMIC waves near the plasmapause, which were identified by the DMSP observations. The estimation of pitch angle diffusion based on the observed wave spectra supports that the observed EMIC waves caused coincident precipitation of both ions and relativistic electrons.
Albert Jay M.
Connors Martin G.
Evans Silvan D.
Jordanova Vania
Miyoshi Yasunobu
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