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From an elevation of ~38 km, the balloon-borne ANtarctic Impulsive TransientAntenna (ANITA) is designed to detect the up-coming radio frequency (RF) signalresulting from a sub-surface neutrino-nucleon collision. Although no neutrinoshave been discovered thus far, ANITA is nevertheless the only experiment toself-trigger on radio frequency emissions from cosmic-ray induced atmosphericair showers. In the majority of those cases, down-coming RF signals areobserved via their reflection from the Antarctic ice sheet and back up to theANITA interferometer. Estimating the energy scale of the incident cosmic raystherefore requires an estimate of the fractional power reflected at the air-iceinterface. Similarly, inferring the energy of neutrinos interacting in-ice fromobservations of the upwards-directed signal refracting out to ANITA alsorequires consideration of signal coherence across the interface. By comparingthe direct Solar RF signal intensity measured with ANITA to thesurface-reflected Solar signal intensity, as a function of incident elevationangle relative to the surface {\Theta}, we estimate the power reflectioncoefficients R({\Theta}). We find general consistency between our averagemeasurements and the values of R({\Theta}) expected from the Fresnel equations,separately for horizontal- vs. vertical-polarizations.

Antarctic Radio Frequency Albedo and Implications for Cosmic Ray Reconstruction