Abstract
We describe an array for performing measurements of counting rates and arrival directions of extensive air showers at primary energy E 0 ⋍ 3 × 10 13 eV and recording the fluctuations in counting rates at E 0 ⋍ 3 × 10 9 eV . The aim of the research is to study the time variations and the anisotropies of cosmic rays and the observable gamma ray sources in the high energy region. The installation, composed of four large area scintillation counters and completely controlled by a microcomputer system, operates at mountain altitude (3500 m a.s.l.). The preanalysis of data, stability tests and periodic calibrations are performed by on-line programs. The method for obtaining the required stability and the corrections on temperature and gain variations are also described.
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