Analysis of cosmic ray anisotropy around 1015 eV using network observation data of air showers

To study the cosmic ray anisotropy, a harmonic analysis is performed on the EAS arrrival LSTs (local sidereal times) observed by the LAAS group. The amplitude and phase of the first harmonic obtained are 0.23 ± 0.04 % and 0.4 ± 0.7 hr LST in the energy region from 5 × 10 13 to 10 15  eV .