Abstract
In this Brief Report, we investigate the modulational instability of electrostatic drift waves in an inhomogeneous plasma with respect to quasi-one-dimensional modulations that primarily propagate along the drift direction (like the drift solitons given by Lakhin, Mikhailovskii, and Onishchenko [Phys. Lett. A 119, 348 (1987); Plasma Phys. Contr. Fusion 30, 457 (1988)]).
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