Enhanced signal of astrophysical tau neutrinos propagating through Earth

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Earth absorbs and of energies above about 100 TeV. As is well-known, although will also disappear through charged-current interactions, the flux will be regenerated by prompt tau decays. We show that this process also produces relatively large fluxes of secondary and, greatly enhancing the detectability of the initial. This is particularly important because at these energies is a significant fraction of the expected astrophysical neutrino flux, and only a tiny portion of the atmospheric neutrino flux.