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Abstract. A microscopic Ioffe-Pritchard trap is formed using a straight, currentcarrying wire, together with suitable auxiliary magnetic fields. By measuring the distribution of cold rubidium atoms held in this trap, we detect a weak magnetic field component ∆B z parallel to the wire. This field is proportional to the current in the wire and is approximately periodic along the wire with period λ = 230 µm. We find that the decrease of this field with distance from the centre of the wire is well described by the Bessel function K 1 (2πy/λ), as one would expect for the far field of a transversely oscillating current within the wire.

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