Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1729r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1729
Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities
Scientific paper
In this paper a comparative study of low frequency electromagnetic Kinetic Alfven wave (KAW) and Inertial Alfven wave (IAW) instability has been investigated by considering a kappa distributed ion beam, propagating parallel and perpendicular to the external magnetic field (B_0) in a dusty magnetoplasma by employing two potential theory. It has been shown that kappa-distributed ion beam is capable of generating KAW/IAW instability and the direction of current is controlled by the beam velocities. It is observed that for parallel beam velocities (V_i0 || B_0), a sufficient amount of charged dust grains introduces two instabilities; one near cut-off frequency (lower instability) and the other below electron cyclotron frequency (upper instability). Perpendicular beam velocities (V_i0 ⊥ B_0) which ignores the contribution of parallel ion current density gives rise to inertial Alfven wave instability, which introduces a modified two stream instability (MTSI) in a dusty plasma in the limit ω_pd^2/c^2 k_⊥^2<<1. Growth rates of IAW instability are compared to MTSI. Effect of different dust parameters, plasma beta (β_i), Lorentzian index and ion streaming effects on the growth rates of instability are presented. It is found that the influence of the Lorentzian distribution function remains insensitive for perpendicular propagation as compared to parallel one. The finding may be applicable for the laboratory plasma and has wide applications in magnetosphere, interstellar as well as dusty space plasma which modify the propagational characteristics of low frequency kinetic/inertial Alfven waves.
Biernat Helfried
Erkaev Nikolai
Langmayr Daniel
Rubab N.
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