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We present an evaluation of the atmospheric tau neutrino flux in the energy range between 10² and 10⁶ GeV. The main source of tau neutrinos is from charmed particle production and decay. The ν_τ→NτX event rate for a detector with a water equivalent volume of 1 km³ is on the order of 60--100 events per year for E_τ>100 GeV, reducing to 18 events above 1 TeV. Event rates for atmospheric muon neutrino oscillations to tau neutrinos are also evaluated.
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Pasquali et al. (1999) studied this question.
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