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On 13 December 2006 the IceTop air shower array at the South Pole detected amajor solar particle event. By numerically simulating the response of theIceTop tanks, which are thick Cherenkov detectors with multiple thresholdsdeployed at high altitude with no geomagnetic cut-off, we determined theparticle energy spectrum in the energy range 0.6 to 7.6 GeV. This is the firstsuch spectral measurement using a single instrument with a well defined viewingdirection. We compare the IceTop spectrum and its time evolution withpreviously published results and outline plans for improved resolution offuture solar particle spectra.

Solar Energetic Particle Spectrum on 13 December 2006 Determined by IceTop