Ion acoustic solitons and supersolitons in a magnetized plasma with nonthermal hot electrons and Boltzmann cool electrons

Physics of Plasmas - Tập 21 Số 8 - 2014
O. R. Rufai1,2, R. Bharuthram1,2, S. V. Singh3,4, G. S. Lakhina3,4
12Indian Institute of Geomagnetism, New Panvel (W), Navi Mumbai, India
2University of the Western Cape 1 , Belville, South Africa
31University of the Western Cape, Belville, South Africa
4Indian Institute of Geomagnetism 2 , New Panvel (W), Navi Mumbai, India

Tóm tắt

Arbitrary amplitude, ion acoustic solitons, and supersolitons are studied in a magnetized plasma with two distinct groups of electrons at different temperatures. The plasma consists of a cold ion fluid, cool Boltzmann electrons, and nonthermal energetic hot electrons. Using the Sagdeev pseudo-potential technique, the effect of nonthermal hot electrons on soliton structures with other plasma parameters is studied. Our numerical computation shows that negative potential ion-acoustic solitons and double layers can exist both in the subsonic and supersonic Mach number regimes, unlike the case of an unmagnetized plasma where they can only exist in the supersonic Mach number regime. For the first time, it is reported here that in addition to solitions and double layers, the ion-acoustic supersoliton solutions are also obtained for certain range of parameters in a magnetized three-component plasma model. The results show good agreement with Viking satellite observations of the solitary structures with density depletions in the auroral region of the Earth's magnetosphere.

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Physics of Plasmas

Tập 21 Số 8

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