We show, through the formulation of a simple theoretical model, that there exists a possibility that a significant number of a energetic ions in the Jovian magnetosphere, and presumably in other astrophysical environments beyond our direct access, owe their origin to a large-scale longitudinal magnetic anomaly corotating with the central body anchoring the magnetosphere, if the invoked magnetic anomaly has a typical boundary thickness comparable to an ion gyroradius, which for a preheated 10-kev heavy ion in the outer Jovian magnetosphere may be of the order of a few Jovian radii. The energy source for the acceleration is a torque from the central planet arising from a differential rotation between the ionosphere and the magnetosphere. The premise and outstanding issues pertaining to the present proposal are further discussed as motivating points for future studies. ¿ American Geophysical Union 1992