Atmospheric neutrinos and the implications to cosmic ray interactions

Atmospheric neutrinos have been used to study neutrino oscillations. Neutrino oscillation analyses with atmospheric neutrinos are discussed. With the increased statistics of the atmospheric neutrino data, it is more important to understand the atmospheric neutrino flux more accurately. Detailed calculations of the atmospheric neutrino fluxes calibrated by the atmospheric muon data show suggestions to the interaction of cosmic rays.