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

概要

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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 a (=T_i/T_e, ion to electron temperature ratio → 0) for Q' < 1 subject to the electrons' drift motion. Interestingly, the formation of higher amplitude (<1) MKdV solitons in the entire range of drift velocity (υ'_e) for Q'<1 is found as more favourable than those for Q'> 1 in an upper range of υ'_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≥υ'_e≥60).
社団法人日本物理学会の論文
2002-12-15