Temperature Anisotropy Instabilities of Obliquely Propagating Electromagnetic Modes in the Magnetosphere

Abstract

The nature of convective instability has been investigated for oblique propagation of the ordinary and extraordinary modes in the magnetosphere arising from temperature anisotropy. The dispersion equation is solved numerically using a TDC 316 computer for different values of the anisotropy ratio <i>T</i>_{<img src='http://www.niscair.res.in/jinfo/line.gif' border=0>}/<i>T</i>_II(=<i>δ</i>) of the perpendicular and parallel temperatures, the McIlwain parameter <i>L</i> and the lef-hand and right-hand cut-off frequencies in the ranges (<i>ω</i>₁ to 4 <i>ω</i>₁, and <i>ω</i>₂ to 4 <i>ω</i>₂ and propagation angle <i><i><img src='/image/spc_char/theta.gif' border=0></i></i>. The dependence of instabilities of both the ordinary and the extraordinary electromagnetic modes on the above parameters is investigated. Computations are also made for perpendicular propagation of the wave.