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# Sensitivity of orbiting JEM-EUSO to large-scale cosmic-ray anisotropies

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### Abstract

The two main advantages of space-based observation of extreme-energy ($$\gtrsim 10^{19}$$~eV) cosmic-rays (EECRs) over ground-based observatories are the increased field of view, and the all-sky coverage with nearly uniform systematics of an orbiting observatory. The former guarantees increased statistics, whereas the latter enables a partitioning of the sky into spherical harmonics. We have begun an investigation, using the spherical harmonic technique, of the reach of \J\ into potential anisotropies in the extreme-energy cosmic-ray sky-map. The technique is explained here, and simulations are presented. The discovery of anisotropies would help to identify the long-sought origin of EECRs.

### Author and article information

###### Journal
22 January 2014
###### Article
10.1088/1742-6596/531/1/012004
1401.5757