Possibility of parametrization of atmospheric muon angular flux using underwater data

We present the formula for angular distribution of integral flux of conventional ($\pi ,K$) muons deep under water taking into account the sphericity of the atmosphere and fluctuations of muon energy losses.The accuracy of this formula for various sea level muon spectra is discussed. The possibility of reconstructing two parameters of sea level spectrum by fitting measured underwater angular intensity is shown for Baikal Neutrino Telescope NT–36 experimental data.