Stability of the kinetic Alfven wave in a current-less plasma. Issue 11 (1st June 2015)

• Record Type: Journal Article
• Authors: Sreekala, G.; Sebastian, Sijo; Michael, Manesh; Abraham, Noble P.; Renuka, G.; Venugopal, Chandu
• Is Part Of: Advances in space research. Volume 55:Issue 11(2015)
• Page Start: 2519
• Page End: 2525
• Publication Date: 2015-06-01
• Subjects: Space sciences -- Periodicals; Astronautics -- Periodicals; Geophysics -- Periodicals; 500.505
• DOI: 10.1016/j.asr.2015.03.016
• Languages: English
• ISSNs: 0273-1177

Abstract

<abstract xml:lang="en" abstract-type="author" id="ab005"> <title id="st050">Abstract</title> <sec> <p id="sp0005">The two potential theory of Hasegawa has been used to derive the dispersion relation for the kinetic Alfven wave (KAW) in a plasma composed of hydrogen, oxygen and electrons. All three components have been modeled by ring distributions (obtained by subtracting two Maxwellian distributions with different temperatures) with the hydrogen and electrons drifting, respectively, with velocities <italic>V_dH</italic> and <italic>V_de</italic>. For the most general case, the dispersion relation is a polynomial equation of order five; it reduces to a relation which supports only one mode when <italic>V_dH</italic> = 0. For typical parameters at comet Halley, we find that both <italic>V_dH</italic> and <italic>V_de</italic> can drive the wave unstable; the KAW is thus driven unstable in a current-less plasma. Such an instability was found for the ion acoustic wave by <xref id="c0045" rid="b0150">Vranjes et al. (2009)</xref>.</p> </sec> </abstract>