The influence of negatively charged heavy ions on the kinetic Alfven wave in a cometary environment |
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Authors: | Venugopal Chandu E Savithri Devi R Jayapal George Samuel S Antony G Renuka |
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Institution: | (1) School of Pure & Applied Physics, Mahatma Gandhi University, Priyadarshini Hills, Kottayam, 686 560, Kerala, India;(2) Department of Physics, University of Kerala, Kariavattom, Thiruvananthapuram, 695 581, Kerala, India |
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Abstract: | Kinetic Alfven waves are important in a wide variety of areas like astrophysical, space and laboratory plasmas. In cometary
environments, waves in the hydromagnetic range of frequencies are excited predominantly by heavy ions. We, therefore, study
the stability of the kinetic Alfven wave in a plasma of hydrogen ions, positively and negatively charged oxygen ions and electrons.
Each species was modeled by drifting ring distributions in the direction parallel to the magnetic field; in the perpendicular
direction the distribution was simulated with a loss cone type distribution obtained through the subtraction of two Maxwellian
distributions with different temperatures. We find that for frequencies w* < wcH +\omega^{*} < \omega_{c\mathrm{H}^{ +}} (ω
∗ and wcH +\omega_{c\mathrm{H}^{ +}} being respectively the Doppler shifted and hydrogen ion gyro-frequencies), the growth rate increases with increasing negatively
charged oxygen ion densities while decreasing with increasing propagation angles, negative ion temperatures and negative ion
mass. |
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