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The two main advantages of space-based observation of extreme energy($\gtrsim5\times10^{19}$ eV) cosmic rays (EECRs) over ground basedobservatories are the increased field of view and the full-sky coverage withnearly uniform systematics across the entire sky. The former guaranteesincreased statistics, whereas the latter enables a clean partitioning of thesky into spherical harmonics. The discovery of anisotropies would help toidentify the long sought origin of EECRs. We begin an investigation of thereach of a full-sky space-based experiment such as EUSO to detect anisotropiesin the extreme-energy cosmic-ray sky compared to ground based partial-skyexperiments such as the Pierre Auger Observatory and Telescope Array. Thetechnique is explained here, and simulations for a Universe with just twononzero multipoles, monopole plus either dipole or quadrupole, are presented.These simulations quantify the advantages of space-based, all-sky coverage.

Sensitivity of full-sky experiments to large scale cosmic ray anisotropies