An Updated Analysis on Atmospheric Neutrinos

We have reanalysed the atmospheric neutrino data including new results from Super-Kamiokande and Soudan-II experiments, under the assumption of two-flavor neutrino oscillation. We present the allowed region of oscillation parameters for the ${\nu }_{\mu }\to {\nu }_{\tau }$ channel. In performing this re-analysis we also take into account some recent theoretical improvements in the flux calculations.