FORBIDDEN REGIONS IN ION TEMPERATURES FOR ION-ACOUSTIC COMPRESSIVE SOLITARY WAVES FOR A PLASMA WITH 2 ELECTRON TEMPERATURES

It is observed that, there exist certain forbidden regions in ion temp eratures, for a compressive solitary wave, which do not have any solit ary wave solution. These regions exist for a two- as well as a single- electron temperature plasma. A physical model is proposed to explain t his phenomenon on the basis of the energy relation. It is revealed tha t a one-dimensional single warm ion fluid consists of two distinct ene rgy components. A simple algebraic condition has been derived which ex presses the balance between nonlinearity and dispersion for a fully no nlinear solitary wave. It shows that both the nonlinearity and dispers ion decrease with increasing ion temperature and that the balance cond ition is well maintained for the whole spectrum of solitary wave solut ions. (C) 1997 American Institute of Physics.