Neutrino Flavor Ratio on Earth and at Astrophysical Sources

We present the reconstruction of neutrino flavor ratios at astrophysical sources. For distinguishing the pion source and the muon-damped source to the 3$σ$ level, the neutrino flux ratios, $R\equivϕ(ν_μ)/(ϕ(ν_e)+ϕ(ν_τ))$ and $S\equivϕ(ν_e)/ϕ(ν_τ)$, need to be measured in accuracies better than 10%.

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