Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13d2115h&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13D-2115
Physics
Plasma Physics
[7800] Space Plasma Physics, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Ion beams are frequently observed in the magnetospheric boundary layers. This work reports the generation of kinetic Alfvén waves (KAWs) by ion beam-plasma interaction in a nonuniform plasma boundary layer using a two-dimensional hybrid simulation. The bulk velocity of the ion beam is assumed to be parallel to the ambient magnetic field B0, with a thermal spread in the velocity space. As a result of the beam-plasma interaction, strong shear Alfvén waves as well as fast mode compressional waves are first generated on the side of the boundary layer with a high density and thus a low Alfvén speed (VA). These waves mainly propagate along the background magnetic field. Later, Alfvén waves are also present inside the boundary layer with a continuous spectrum. As the perpendicular wave vector k⊥ increases with time, large-amplitude, short wavelength KAWs with k⊥>>k|| clearly form in the boundary layer. Reflected waves are also found on the high density side of the boundary. The physical mechanism for the generation of KAWs is discussed.
Hong Mingyi
Lin Yangtin
Wang Xinhua
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