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The phenomenon of subpulse drifting offers unique insights into the emissiongeometry of pulsars, and is commonly interpreted in terms of a rotatingcarousel of "spark" events near the stellar surface. We develop a detailedgeometric model for the emission columns above a carousel of sparks that isentirely calculated in the observer's inertial frame, and which is consistentwith the well-understood rotational effects of aberration and retardation. Weexplore the observational consequences of the model, including (1) theappearance of the reconstructed beam pattern via the cartographic transform and(2) the morphology of drift bands and how they might evolve as a function offrequency. The model, which is implemented in the software package PSRGEOM, isapplicable to a wide range of viewing geometries, and we illustrate itsimplications using PSRs B0809+74 and B2034+19 as examples. Some specificpredictions are made with respect to the difference between subpulse evolutionand microstructure evolution, which provides a way to further test our model.

On the Geometry of Curvature Radiation and Implications for Subpulse Drifting