Modified Korteweg de Vries (MKdV) and Korteweg de Vries (KdV) Solitons in a Warm Plasma with Negative Ions and Electrons' Drift Motion

Abstract

In this investigation, both compressive and rarefactive Korteweg de Vries (KdV) solitons of high amplitude are shown to exist in a warm plasma under the influence of electrons' drift motion for different values of Q ′ (= m j / m i , negative to positive ion mass ratio) greater or less than one. But these KdV solitons of high amplitude are noticed in the plasma for negligible temperature α (= T i / T e , ion to electron temperature ratio → 0) for Q ′ 1 in an upper range of v e ′ ≥45 when temperature is small. On the other hand, for concentration of heavier population of negative ions ( Q ′ >1) in the warm plasma, MKdV solitons of small but significant amplitude are established to exist even in a new range (45≤ v e ′ ≤60).