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Atmospheric Cherenkov Radiation

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Extensive Air Showers
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Overview

After a brief historic review the basic phenomenology and the fundamental physical process that are responsible for producing Cherenkov radiation in refractive media are explained, followed by the elementary theory of single particle Cherenkov radiation that covers the radiation yield and spectral features. Subsequently the phenomenology and theory of Cherenkov radiation in air showers are discussed, including characteristic features such as the lateral, temporal and spectral distribution of the photons, polarization aspects, the curvature of the light front and distribution substructures. The relation between the energy of the shower initiating primary and the optical observables at ground level are analyzed and the procedure to estimate the primary energy is outlined. The effects of the nature of the primary on the Cherenkov pattern, in particular of the mass if the primary is a hadron, are outlined and correlations between Cherenkov and particle observables are illuminated. Gamma ray astronomy is briefly touched and the technique of Cherenkov imaging is presented. These topics are followed by a discussion of the optical background, atmospheric light scattering, absorption and attenuation. The chapter ends with a compilation of data that cover the entire scope of experimental work, from the early stages to the present.

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Notes

  1. 1.

    For a historic account see Weekes (1996).

  2. 2.

    The integral rate of hadron induced showers producing a ≥1 TeV equivalent gamma ray shower signal is \(\sim 5\cdot 10^{-8}\;\textrm{cm}^{-2}\;\textrm{s}^{-1}\), masking completely the general Galactic disk emission expected at a rate of approximately 10−12 cm−2s−1 within an acceptance angle of 1° (Drury, 1996).

  3. 3.

    The first to use the air Cherenkov imaging technique on common air showers were Hill and Porter (1961) who used an opto-electronic image intensifier.

  4. 4.

    Modern large imaging systems are operated over an impact parameter range from 0 to 500 m.

  5. 5.

    Optical filters were frequently used in the past to reduce contributions from longer wavelengths to the background; today photomultipliers with appropriate photocathode sensitivities are being used.

  6. 6.

    Glushkov et al. (1979) specify in their paper a very weak size dependence of C, \(C = C(b,k)\); in other work of the same group the size dependence is disregarded.

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Correspondence to Peter K.F. Grieder .

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© 2010 Springer-Verlag Berlin Heidelberg

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Grieder, P.K. (2010). Atmospheric Cherenkov Radiation. In: Extensive Air Showers. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76941-5_16

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