Study of gradient effects on inertial Alfvén waves in plasma sheet boundary layer region—kinetic approach

Agarwal, Priyanka; Varma, P.; Tiwari, Meenakshi

doi:10.1007/s10509-013-1615-y

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“…These waves have been rigorously investigated considering Maxwellian distribution function of electrons and ions in AAR as well as laboratory plasma (Thompson and Lysak 1996;Chaston et al 2002;Dubinin et al 2005;Watt et al 2006;Rankin 2007, 2008;Parks et al 2015). Agarwal et al (2011Agarwal et al ( , 2014 have investigated frequency and damping rate of IAW in cusp and plasma sheet boundary layer region considering finite ion gyroradius effect. Recently, Kumar et al (2015) have developed simulation model to investigate the density cavitation by IAW using FAST observations at 1700 km altitude.…”

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confidence: 99%

Inertial Alfvén waves in auroral acceleration region with H+, He+ and O+ ions plasma

Tamrakar

Varma

Tiwari

2019

Astrophys Space Sci

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The propagation of inertial Alfvén wave is investigated in cold, low-β, homogeneous and bi-Maxwellian plasma consisting of multi-ions (H + , He + and O + ). Kinetic approach is adopted to derive the dispersion relation, damping rate, group velocity and growth/ damping length of the wave. Figures are exhibited with respect to ck ⊥ /ω pe . Effects of density variation with multi-ions are analysed on frequency, damping rate, parallel and perpendicular components of group velocity and growth/ damping length of the inertial Alfvén wave. It is found that varying densities of multi-ions significantly influence the frequency, damping rate and group velocity of inertial Alfvén wave. The wave frequency is observed between 0.5 to 18 s −1 pertaining to observational data. The increasing density of heavy ions reduces the frequency of waves. The presence of He + and O + enhances the damping of wave showing more transfer of energy from wave to particles leading to increase in electron acceleration. The order of parallel and perpendicular group velocity is found to be 10 9 cm/s and 10 5 cm/s respectively. Maximum perpendicular growth length is observed corresponding to the minimum damping rate of wave at ck ⊥ /ω pe < 1, signifying the dynamics in transverse direction to the magnetic field which are more significant in the present analysis. The parameters relevant to auroral acceleration region are used for graphical analysis. The applications of present study may be towards the electron acceleration in the dynamics of auroral acceleration region consisting of heavy ions in background plasma.

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