PROPERTIES OF WIDE-PEAK AUTOSOLITONS IN ELECTRON-HOLE AND GAS PLASMAS

With the use of the multifunctional variational method we have analyze d the shape and other parameters of a wide-peak autosoliton, which can be excited in electron-hole or slightly ionized gas plasmas heated by constant electric current or electromagnetic radiation. We have shown that this autosoliton exists even in very weakly nonequilibrated plas mas. In a number of cases the minimal pumping power needed to maintain this autosoliton is proportional to epsilon(2), whereas the maximum t emperature of hot carriers in its center, T-max proportional to epsilo n(-4), where epsilon = l/L much less than 1, L is the ambipolar diffus ion length, and I is the length of the hot electron energy relaxation.