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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: [email protected]
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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

References

Aglietta, M., et al. 1996 (EAS-TOP Collaboration) 1996, ApJ, 470, 501 Google Scholar
Aglietta, M., et al. (EAS-TOP Collaboration) 2003, Proc. 28th ICRC, Tsukuba, Japan, HE 1.1, 183, edited by T. Kajita, Y. Asaoka, A. Kawachi, Y. Matsubara, M. Sasaki, Tokyo, University Academy Press, Inc.Google Scholar
Allan, H. R. 1972, ApJL, 12, 237 Google Scholar
Antoni, T. et al. 2004, ApJ, 604, 687 CrossRefGoogle Scholar
Bahmanabadi, M. et al. 1998, ExA, 8, 211 Google Scholar
Bahmanabadi, M. et al. 2003, ExA, 15, 13 Google Scholar
Clay, R. W., McDonough, M. A. & Smith, A. G. K. 1997, Proc. 25th ICRC, Durban, South Africa, 4, 185 Google Scholar
Compton, A. H. & Getting, I. A. 1935, PhRv, 47, 817 Google Scholar
Farley, F. J. M. & Storey, J. R. 1954, PPS, A67, 996 Google Scholar
Gaisser, T. K. 1990, in Cosmic Rays and Particle Physics (New York: Cambridge University Press)Google Scholar
Heck, D. et al. 1998, Report FZKA 6019, Forschungszentrum KarlsruheGoogle Scholar
Jacklyn, R. M. 1986, PASA, 6, 425 CrossRefGoogle Scholar
Khakian Ghomi, M., Bahmanabadi, M. & Samimi, J. 2005, A&A, 434, 459 Google Scholar
Kifune, T. et al. 1986, J. PhG, 12, 129 CrossRefGoogle Scholar
Lin, T. F., Fields, B., Gress, J. & Poirier, J. 1999, Proc. 26th ICRC, Salt Lake city, Utah, USA, HE3.2.09, 100, edited by D. Kieda, M. Salamon, and B. Dingus, High Energy Astro Physics institute University of UtahGoogle Scholar
Linsley, J. 1975, PhRvL, 34, 1530 Google Scholar
Poirier, J., D'Andrea, C. & Dunford, M. 2001, Proc. 27th ICRC, Hamburg, Germany, 3930, edited by K. H. Kampert, G. Hainzelmann, and C. Spiering, Copernicus systems and Technology GmbH, Berlin, GermanyGoogle Scholar
Smith, A. G. K. & Clay, R. W. 1997, AuJPh, 50, 827 Google Scholar