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Galactic Anisotropy of Cosmic Ray Intensity Observed by an Air Shower Experiment

Published online by Cambridge University Press:  05 March 2013

Mahmud Bahmanabadi ,
Mehdi Khakian Ghomi ,
Farzaneh Sheidaei  and
Jalal Samimi
Mahmud Bahmanabadi*
Affiliation:
Physics Department, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran.
Mehdi Khakian Ghomi
Affiliation:
Physics Department, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran.
Farzaneh Sheidaei
Affiliation:
Physics Department, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran.
Jalal Samimi
Affiliation:
Physics Department, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran.
*
BCorresponding author. E-mail: bahmanabadi@sina.sharif.ac.ir
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Abstract

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We have monitored multi-TeV cosmic rays by a small air shower array in Tehran (35°43′ N, 51°20′ E, 1200 m = 890 g cm−2). More than 1.1 × 106 extensive air shower events were recorded. These observations enabled us to analyse sidereal variation of the galactic cosmic ray intensity. The observed sidereal daily variation is compared to the expected variation which includes the Compton–Getting effect due to the motion of the earth in the Galaxy. In addition to the Compton–Getting effect, an anisotropy has been observed which is due to a unidirectional anisotropy of cosmic ray flow along the Galactic arms.

Keywords

cosmic rays
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 23 , Issue 3 , 2006 , pp. 129 - 134
Copyright
Copyright © Astronomical Society of Australia 2006

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