Automated tracking of magnetograms provides the ability to detect magnetic features in an unbiased manner. Such feature tracking shows many instances of apparent unipolar flux emergence, which must be due to processes below the detection limit of routine measurements. We use many of these events to distinguish between two models of small-scale magnetic flux formation. In "Small Flux Convergence" two or more magnetic features below the resolution limit come together to produce a detectable feature. In "Asymmetric Emergence" the cross-section of one end of the flux tube is too large, and hence the field too weak, to be detected. By comparing the data with a simple Asymmetric Emergence model, we find that asymmetric bipolar emergence could account for, at most, about half of the unipolar events.
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