Low frequency solitons and double layers in a magnetized plasma with two temperature electrons

Physics of Plasmas - Tập 19 Số 12 - 2012
O. R. Rufai1, R. Bharuthram2, S. V. Singh3,4, G. S. Lakhina3
1Department of Physics, University of the Western Cape 1 , Private Bag X17, Bellville 7535, South-Africa
2Office of the Deputy Vice Chancellor (Academic), University of the Western Cape, Bellville 2 , South-Africa
3Indian Institute of Geomagnetism 3 , New Panvel (W), Navi Mumbai-410218, India
4School of Chemistry and Physics, University of Kwa-Zulu Natal 4 , Durban, South-Africa

Tóm tắt

Finite amplitude non-linear ion-acoustic solitary waves and double layers are studied in a magnetized plasma with cold ions fluid and two distinct groups of Boltzmann electrons, using the Sagdeev pseudo-potential technique. The conditions under which the solitary waves and double layers can exist are found both analytically and numerically. We have shown the existence of negative potential solitary waves and double layers for subsonic Mach numbers, whereas in the unmagnetized plasma they can only in the supersonic Mach number regime. For the plasma parameters in the auroral region, the electric field amplitude of the solitary structures comes out to be 49 mV/m which is in agreement of the Viking observations in this region.

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Physics of Plasmas

Tập 19 Số 12

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