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Motivated by the detection of a significant dipole structure in the arrivaldirections of ultrahigh-energy cosmic rays above 8 EeV reported by the PierreAuger Observatory (Auger), we search for a large-scale anisotropy using datacollected with the surface detector array of the Telescope Array Experiment(TA). With 11 years of TA data, a dipole structure in a projection of the rightascension is fitted with an amplitude of 3.3+- 1.9% and a phase of 131 +- 33degrees. The corresponding 99% confidence-level upper limit on the amplitude is7.3%. At the current level of statistics, the fitted result is compatible withboth an isotropic distribution and the dipole structure reported by Auger.

Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment