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The ANITA collaboration has recently announced the supposed observation oftwo upward going cosmic ray showers at earth emergence angles $27^{\circ}$ and$35^{\circ}$ with reconstructed energy $\sim$0.6~EeV. Upward air showers (UAS)are expected from tau leptons resulting from the interaction of astrophysicalneutrinos inside the Earth. However, at emergence angles larger than$20^{\circ}$, the probability of tau emergence from a neutrino is less than$10^{-7}$, which makes a standard model explanation for these signalsdifficult.  If confirmed by other experiments, these energetic events would strengthenthe argument for physics beyond the standard model. Both the proposed EUSO-SPB2and the POEMMA instruments will be equipped with optical Cherenkov detectors inorder to measure the Cherenkov emission from UAS, which, if aimed low enoughbelow the horizon, could, in principle, capture these events as well. Anobservation in the Cherenkov channel would help to rule out anthropogenic andother explanations for these events. We present here the sensitivity to theANITA anamolous events for a balloon based and a satellite based Cherenkovdetector, as could be realized in the upcoming EUSO-SPB2 mission and theproposed POEMMA mission, respectively.

Sensitivity to Atypical Tau Initiated Air Showers For a High-Altitude Optical Cherenkov Detector