Simulation of electromagnetic ion cyclotron triggered emissions in the Earth's inner magnetosphere

Details Simulation of electromagnetic ion cyclotron triggered emissions in the Earth's inner magnetosphere Simulation of electromagnetic ion cyclotron triggered emissions in the Earth's inner magnetosphere

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11605212s&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A5, CiteID A05212

Physics

Plasma Physics

2

Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

In a recent observation by the Cluster spacecraft, emissions triggered by electromagnetic ion cyclotron (EMIC) waves were discovered in the inner magnetosphere. We perform hybrid simulations to reproduce the EMIC triggered emissions. We develop a self-consistent one-dimensional hybrid code with a cylindrical geometry of the background magnetic field. We assume a parabolic magnetic field to model the dipole magnetic field in the equatorial region of the inner magnetosphere. Triggering EMIC waves are driven by a left-handed polarized external current assumed at the magnetic equator in the simulation model. Cold proton, helium, and oxygen ions, which form branches of the dispersion relation of the EMIC waves, are uniformly distributed in the simulation space. Energetic protons with a loss cone distribution function are also assumed as resonant particles. We reproduce rising tone emissions in the simulation space, finding a good agreement with the nonlinear wave growth theory. In the energetic proton velocity distribution we find formation of a proton hole, which is assumed in the nonlinear wave growth theory. A substantial amount of the energetic protons are scattered into the loss cone, while some of the resonant protons are accelerated to higher pitch angles, forming a pancake velocity distribution.

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