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We consider the amplitude modulation of low-frequency, long wavelengthelectrostatic drift wave packets in a nonuniform magnetoplasma with the effectsof equilibrium density, electron temperature and magnetic fieldinhomogeneities. The dynamics of the modulated drift wave packet is governed bya nonlinear Schr\"odinger equation. The latter is used to study themodulational instability of a Stoke's wave train to a small longitudinalperturbation. It is shown that the drift wave packet is stable (unstable)against the modulation when the drift wave number lies in $0< k < 1/\sqrt{2}$$(1/\sqrt{2}<k<1)$. Thus, the modulated drift wave packet can propagate in theform of bright and dark envelope solitons or as a drift wave rogon.

Amplitude modulated drift wave packets in a nonuniform magnetoplasma