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Study on anisotropy of cosmic ray distribution with a small array of water Cherenkov detectors

F. Sheidaei1, M. Bahmanabadi1,2,*, A. Keivani1, M. Khakian Ghomi2, J. Samimi1,2, and A. Shadkam1

  • 1Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran
  • 2ALBORZ Observatory, Sharif University of Technology, Tehran, Iran

  • *bahmanabadi@sina.sharif.edu
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Phys. Rev. D 76, 082002 – Published 26 October, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.082002

Abstract

The study of the anisotropy of the arrival directions is an essential tool to investigate the origin and propagation of cosmic ray primaries. A simple way of recording many cosmic rays is to record coincidences between a number of detectors. We have monitored multi-TeV cosmic rays by a small array of water Cherenkov detectors in Tehran (35°43′ N, 51°20′ E, 1200 m above sea level). More than 1.1×106 extensive air shower events were recorded. In addition to the Compton-Getting effect due to the motion of the Earth in the Galaxy, an anisotropy has been observed which is due to a unidirectional anisotropy of cosmic ray flow along the Galactic arms.

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Phys. Rev. D 76, 082002– Published 26 October, 2007
  • Received 8 May 2007

© 2007 American Physical Society

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