Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1589u&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1589
Physics
Plasma Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Complex response of electron fluxes to varying geomagnetic activity is determined by multiple competing electron acceleration and loss mechanisms. Mechanisms act on both “global” scales, braking the second and/or the third invariant of trapped electrons, and on “local” scales, breaking the first invariant. Predictive understanding of the outer belt can be achieved only by quantifying contributions of individual local and global mechanisms to global variability of relativistic electron fluxes. One of the local loss mechanisms of radiation belt electron is pith-angle scattering by Electromagnetic Ion Cyclotron (EMIC) waves. In this work we use the data from CRRES and AMPTE/CCE to address the efficiency of EMIC waves as the loss mechanism of the outer belt electrons. The energy of the electron cyclotron resonance with EMIC waves is sensitively depends on the proximity of the wave power to the local gyrofrequency of He and O ions. Only the waves with power close to the ion gyrofrequency can interact with the bulk of the outer belt energy spectrum. We present observations of the waves with power in the immediate vicinity of He and O gyrofrequencies and compute the bounce average diffusion coefficients of electron scattering by these waves. We show that the observed EMIC waves can produce rapid scattering of electron >300 keV, which suggests that they play a major role in storm-time losses of the outer belt electrons.
Anderson Benjamin J.
Mansergh Thorne Richard
Shprits Yuri Y.
Takahashi Keitaro
Ukhorskiy Aleksandr Y.
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