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The CoGeNT collaboration has recently published results from a fifteen monthdata set which indicate an annual modulation in the event rate similar to whatis expected from weakly interacting massive particle interactions. It has beensuggested that the CoGeNT modulation may actually be caused by other annuallymodulating phenomena, specifically the flux of atmospheric muons underground orthe radon level in the laboratory. We have compared the phase of the CoGeNTdata modulation to that of the concurrent atmospheric muon and radon datacollected by the MINOS experiment which occupies an adjacent experimental hallin the Soudan Underground Laboratory. The results presented are obtained byperforming a shape-free $\chi^{2}$ data-to-data comparison and from asimultaneous fit of the MINOS and CoGeNT data to phase-shifted sinusoidalfunctions. Both tests indicate that the phase of the CoGeNT modulation isinconsistent with the phases of the MINOS muon and radon modulations at the\unit[3.0]{$\sigma$} level.

Comparisons of annual modulations in MINOS with the event rate modulation in CoGeNT