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Linear electrostatic waves in two-temperature electron-positron plasmas
Lazarus, I. J.; Bharuthram, R.; Singh, S. V.; Pillay, S. R.; Lakhina, G. S.; Lakhina
AA(Department of Physics, Durban University of Technology, Durban, South Africa), AB(University of the Western Cape, Modderdam Road, Bellville 7530, South Africa), AC(Indian Institute of Geomagnetism, Navi Mumbai, India ()), AD(School of Physics, University of KwaZulu-Natal, Durban, South Africa), AE(Indian Institute of Geomagnetism, Navi Mumbai, India ()), AF()
Journal of Plasma Physics, Volume 78, Issue 6, pp. 621-628
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(c) 2012: Copyright © Cambridge University Press 2012
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Linear electrostatic waves in a magnetized four-component, two-temperature electron-positron plasma are investigated, with the hot species having the Boltzmann density distribution and the dynamics of cooler species governed by fluid equations with finite temperatures. A linear dispersion relation for electrostatic waves is derived for the model and analyzed for different wave modes. Analysis of the dispersion relation for perpendicular wave propagation yields a cyclotron mode with contributions from both cooler and hot species, which in the absence of hot species goes over to the upper hybrid mode of cooler species. For parallel propagation, both electron-acoustic and electron plasma modes are obtained, whereas for a single-temperature electron-positron plasma, only electron plasma mode can exist. Dispersion characteristics of these modes at different propagation angles are studied numerically.
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