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The magnetized MINOS near detector can accurately determine the charge signof atmospheric muons, this facilitates a measurement of the atmospheric muoncharge ratio. To reduce the systematic error associated with geometric bias andacceptance we have combined equal periods of data obtained with oppositemagnetic field polarities. We report a charge ratio of$1.2666\pm0.0015(stat.)^{+0.0096}_{-0.0088}(syst.)$ at a meanE$_{\mu,0}cos(\theta)$=\unit[63]{GeV}. This measurement is consistent with theworld average\cite{Hebbeker}\cite{Haino}\cite{Achard} but significantly lowerthan the earlier observation at the MINOS far detector\cite{Adamson}. Thisincrease is shown to be consistent with the hypothesis that a greater fractionof the observed muons arise from kaon decay within the cosmic ray shower.

The Atmospheric Muon Charge Ratio at the MINOS Near Detector