A Study of the Effect of Geomagnetic Field on Extensive Air Showers with Small Arrays |
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| Authors: | M Bahmanabadi A Anvari M Khakian Ghomi D Purmohammad J Samimi M Lamehi Rachti |
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| Institution: | (1) Physics Department, Sharif University of Technology, Tehran, Iran;(2) Van de Graaf Laboratory, Aeio, Tehran, Iran |
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| Abstract: | We have studied Extensive Air Showers (EAS) with two small arraysof 1 m2 scintillation detectors inTehran, 1200 m above sea level.The distribution of air showersin zenith and azimuth angles has been studied and a cosnΘdistribution with n = 7.2±0.2 was obtained for zenith angledistribution. An asymmetry has been observed in the azimuthaldistribution of EAS of cosmic rays because of magnetic field ofthe Earth. Amplitudes of the first and the second harmonics ofobserved distribution depend on zenith angle as A
I ≈ (0.02 + 0.35 sin2Θ)±0.02, and A
II ≈ (0.03 + 0.42 sin4Θ)±0.03. Meanwhile, the uncertainties arising from the instrument, transit location of shower particles in the scintillator and fluctuations in the shower front have been calculated. |
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| Keywords: | cosmic rays Extensive Air Shower geomagnetic field |
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