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Future space-based experiments, such as OWL and JEM-EUSO, view largeatmospheric and terrestrial neutrino targets. With energy thresholds slightlyabove 10^19 eV for observing airshowers via air fluorescence, the potential forobserving the cosmogenic neutrino flux associated with the GZK effect islimited. However, the forward Cherenkov signal associated with the airshowercan be observed at much lower energies. A simulation was developed to determinethe Cherenkov signal strength and spatial extent at low-Earth orbit forupward-moving airshowers. A model of tau neutrino interactions in the Earth wasemployed to determine the event rate of interactions that yielded a tau leptonwhich would induce an upward-moving airshower observable by a space-basedinstrument. The effect of neutrino attenuation by the Earth forces the viewingof the Earth's limb to observe the nu_tau-induced Cherenkov airshower signal atabove the OWL Cherenkov energy threshold of ~10^16.5 eV for limb-viewed events.Furthermore, the neutrino attenuation limits the effective terrestrial neutrinotarget area to ~3x10^5 km^2 at 10^17 eV, for an orbit of 1000 km and aninstrumental full Field-of-View of 45 degrees. This translates into anobservable cosmogenic neutrino event rate of ~1/year based upon two differentmodels of the cosmogenic neutrino flux, assuming neutrino oscillations and a10% duty cycle for observation.

The Potential of Spaced-based High-Energy Neutrino Measurements via the Airshower Cherenkov Signal