Evidence of water ice deposits in the Permanently Shadowed Regions (PSRs) on Mercury have
engendered investigations for ice in the Moon’s PSRs. However, continued radar investigations
into the Moon’s polar regions lack conclusive evidence for ice in radar backscattering data due to
volume scattering and surface roughness. These previous radar experiments have ruled out shallow
regions for ice deposits, but not at depths > 5 m. The radio signature produced in ultrahigh energy
(UHE) particle showers, known as the Askaryan signal, offers a novel approach to probe deeper
than previously achievable in search for buried ice deposits. Due to the linear polarization of the
Askaryan signal, the dielectric properties of an ice layer would manifest as a polarity flip relative
to direct measurement. The Cosmic Ray Lunar Sounder (CoRaLS) is a proposed lunar orbiter
mission that will leverage the polarity flip in the Askaryan pulse upon reflection to determine the
existence, location, and ice purity of these deep subsurface ice deposits.