Kinetic Alfven wave with density variation and loss-cone distribution function of multi-ions in PSBL region.

Kinetic Alfven wave (KAW) generation due to variation of loss-cone index <italic>J</italic> and density of multi-ions (H⁺, He⁺ and O⁺) in the plasma sheet boundary layer region (PSBL) is investigated. Kinetic approach is used to derive dispersion relation of wave using Vlasov equation. Variation of frequency with respect to wide range of <italic>k</italic>_⊥<italic>ρ_i</italic> (where <italic>k</italic>_⊥ is wave vector across the magnetic field, <italic>ρ_i</italic> is gyroradius of ions and <italic>i</italic> denotes H⁺, He⁺ and O⁺ ions) is analyzed. It is found that each ion gyroradius and number density shows different effect on wave generation with varying width of loss-cone. KAW is generated with multi-ions (H⁺, He⁺ and O⁺) over wide regime for J=1 and shows dissimilar effect for J=2. Frequency is reduced with increasing density of gyrating He⁺ and O⁺ ions. Wave frequency is obtained within the reported range which strongly supports generation of kinetic Alfven waves. A sudden drop of frequency is also observed for H⁺ and He⁺ ion which may be due to heavy penetration of these ions through the loss-cone. The parameters of PSBL region are used for numerical calculation. The application of these results are in understanding the effect of gyrating multi-ions in transfer of energy and Poynting flux losses from PSBL region towards ionosphere and also describing the generation of aurora. [ABSTRACT FROM AUTHOR]