Authors: Suresh Chandra
Publish Date: 2012/12/29
Volume: 87, Issue: 6, Pages: 601-606
Abstract
For diffusive and viscous plasma the dispersion relation ω2 = k 2 v A 2 − iων + η + νηk 4 is applied for the North Polar Coronal Hole where we have assumed the angular frequency ω to be a real quantity and the wave number k as a complex quantity For ω = 2π/τ we have chosen three values 10−2 10−3 and 10−4 s for τ For each value of τ we have considered three situations i where ν = 0 no viscosity ii where η = 0 no magnetic diffusivity and iii where both the diffusivity η and viscosity ν are present For the cases i and ii we have obtained two solutions ±k r + i k i But for the case iii we have obtained two pairs of solutions ±k r1 + i k i1 and ±k r2 + i k i2 These two pairs correspond to the fastmode and slowmode waves
Keywords: