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We present a beam pattern measurement of the Canadian Hydrogen IntensityMapping Experiment (CHIME) made using the Sun as a calibration source. As CHIMEis a pure drift scan instrument, we rely on the seasonal North-South motion ofthe Sun to probe the beam at different elevations. This semiannual range inelevation, combined with the radio brightness of the Sun, enables a beammeasurement which spans ~7,200 square degrees on the sky without the need tomove the telescope. We take advantage of observations made near solar minimumto minimize the impact of solar variability, which is observed to be <10% inintensity over the observation period. The resulting data set is highlycomplementary to other CHIME beam measurements -- both in terms of angularcoverage and systematics -- and plays an important role in the ongoing programto characterize the CHIME primary beam.

Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment