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Effect of the general loss-cone distribution function on kinetic Alfvén waves—a kinetic approach

Published online by Cambridge University Press:  01 December 2007

NIDHI SHUKLA ,
P. VARMA  and
M.S. TIWARI
NIDHI SHUKLA
Affiliation:
Department of Physics and Electronics, Dr. H. S. Gour University, Sagar (M.P.)—470003, India ([email protected])
P. VARMA
Affiliation:
Department of Physics and Electronics, Dr. H. S. Gour University, Sagar (M.P.)—470003, India ([email protected])
M.S. TIWARI
Affiliation:
Department of Physics and Electronics, Dr. H. S. Gour University, Sagar (M.P.)—470003, India ([email protected])
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Abstract

Kinetic Alfvén waves are investigated in the presence of a general loss-cone distribution function including finite electron pressure and ion-gyroradius effects. The dispersion relation and damping/growth rate are evaluated for different electron to ion temperature ratios, Te/Ti, using a kinetic approach. The wave frequency ω and damping/growth rate γL are evaluated for two regimes of propagation, k⊥ρi < 1 and k⊥ρi > 1, where k⊥ is the perpendicular wave number and ρi is the ion-gyroradius. An enhancement of the wave frequency and a reduction in the damping rate are predicted by steep loss-cone distribution indices and Te/Ti. The growth of the wave is also noticed at higher values of the distribution index and lower Te/Ti. Plasma parameters appropriate to the plasma sheet boundary layer (PSBL) are used to discuss the propagation of kinetic Alfvén waves from the PSBL to the auroral ionosphere.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 6 , December 2007 , pp. 911 - 920
Copyright
Copyright © Cambridge University Press 2007

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