The effect of wind on cosmic-ray muon asymmetry

Physics

Scientific paper

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Asymmetry, Cosmic Rays, Muons, Wind Effects, Anisotropy, Approximation, Density Distribution, Energy Spectra, Geostrophic Wind, Particle Production, Pressure Gradients, Wind Variations

Scientific paper

The effect of horizontal density and pressure gradients (i.e., atmospheric wind) on the muon asymmetry measured with crossed telescopes was investigated. By using the model of Judge and Nash (1965) for muon production and the geostrophic approximation for atmospheric dynamics, theoretical estimates were obtained which agree with experimental results. The effect of wind sometimes exceeds 0.5%. Winds above the 100 mbar pressure level, which affect the primary proton spectrum, have the strongest influence on the observed asymmetry. The magnitude and variation of the local wind field should also be taken into account in accurate anisotropy measurements.

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