| Ion-acoustic waves at the night side of Titan’s ionosphere: higher-order approximation | 
| S M Ahmed,E R Hassib,U M Abdelsalam,R E Tolba,W M Moslem | 
| Figure 4. The contour plot of (a) the maximum amplitude φ(0) and (b) the width W of the IASWs with N2 and λ, where μ2 = 0.97, μ3 = 0.68, N3 = 0.1, and σ1,2,3 = 0.1. | 
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