Research output: Contribution to journal › Article

Original language | English |
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Journal | Proceedings of the fourth International Conference on Plasma Physics |

State | Published - 1 Jul 1992 |

It is usual in studies of solitons and double layers in fluid plasmas to
make the assumption of Boltzmann electrons, i.e. because of their high
mobility, the electron mass is neglected. In a recent paper it has,
however, been suggested that electron inertia effects on ion-acoustic
solitons may exceed relativistic effects. The purpose of this study is
to determine finite electron mass effects on the amplitudes and
existence domains of ion-acoustic solitons. We consider a plasma
consisting of cold hydrogen ions and two isothermal electron fluids at
different temperatures. The electron density distributions are
determined using the plasma fluid equations, thus introducing the
electron mass. Instead of using the small-amplitude KdV equation we
carry out arbitrary-amplitude calculations from the fluid equations. The
existence of a soliton is deduced from the form of the Sagdeev
pseudopotential. Our main result is that particularly in the case of
rarefactive solitons, the existence domain is considerably
over-estimated by the Boltzmann electron model.

- Collisionless plasma, Ion-acoustic waves, Solitons, Plasma fluid equations

ID: 23484987