a1 Institut für Theoretische Physik, Ruhr-Universität Bochum, 4630 Bochum 1, Federal Republic of Germany
It is shown that a modified electron-acoustic wave exists in a plasma with distinct hot and cold electron components. The frequency of this wave depends strongly on the cold electron number density. Solitons associated with the modified electron-acoustic waves are also discussed.
(Received October 19 1982)