Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21d..04o&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM21D-04
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2778] Magnetospheric Physics / Ring Current
Scientific paper
We use 2.5-D electromagnetic hybrid (kinetic ions, fluid electrons) simulations to investigate the generation, propagation and nonlinear evolution of EMIC waves in a dipolar magnetic field. EMIC waves are generated by the temperature anisotropy of energetic protons (e.g. ring current) with perpendicular temperature larger than parallel. In this study, we examine the effects of the level of temperature anisotropy on the saturation amplitude of the waves as a function of radial distance and magnetic latitude. Similarly, the dispersive and propagation properties of EMIC waves are heavily influenced by the presence of cold heavy ions such as He+ and O+. The impact of these ions on EMIC waves as a function of their density is also investigated. In the model, energetic protons are injected in the equatorial region where they expand along the magnetic field to higher latitudes. In the absence of EMIC waves, magnetic mirroring confines these ions to region with maximum latitude and they never reach the ionosphere. Generation of EMIC waves results in pitch angle scattering of the energetic ions so that they reach the ionosphere. The effectiveness of EMIC waves in scattering of these ions as a function of temperature anisotropy and the composition of the cold background plasma is discussed in this presentation.
Bortnik Jacob
Mansergh Thorne Richard
Omidi Nojan
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