Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3816109c&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 16, CiteID L16109
Physics
Ionosphere: Wave/Particle Interactions (7867), Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Ring Current, Radio Science: Waves In Plasma (7867)
Scientific paper
The dispersion relation of parallel propagating EMIC waves is investigated in a magnetized homogeneous plasma consisting of hot H+ and He+ ions. We demonstrate that the hot plasma effects associated with He+ and H+ significantly modify the cold plasma dispersion relation, especially near ΩHe+. For plasmas with a sufficiently small fraction of warm He+ and a sufficiently dense, hot and anisotropic H+ population, the cold plasma stop band above ΩHe+ may vanish, and waves near ΩHe+ may be unstable. The maximum wavenumber for unstable L-mode waves due to the hot plasma modification is used to identify the plasma conditions required for EMIC wave scattering of MeV electrons. We conclude that relatively extreme conditions (ωpe/|Ωe| > ˜25, and H+ anisotropy >1) are required for resonance with electrons near 1 MeV, which limits such scattering only to the region just inside the plasmasphere or storm time plumes.
Bortnik Jacob
Chen Lunjin
Mansergh Thorne Richard
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