Amplified Tau-airshower at horizons may well open a novel powerful windows , at PeV-EeV energy , to Neutrino Astronomy .
Neutrino induced air-showering astronomy rise because of neutrino masses , their mixing and the consequent replenishment of tau flavor during neutrino flight into spaces ; Tau-Air-Showers escaping the Earth are the main traces amplified by its millions muon , billions gamma and thousand billions photon secondaries .
Earth edges and its sharp shadows is the huge beam-dump detector for UHE neutrino and the almost noise-free screen for tau air-showers ( as well as for PeVs anti-neutrino electron scattering on air electrons by resonant interactions ) .
Crown array detectors for horizontal Cherenkov signals on mountains , on balloons and satellites widening the solid angle view are being elaborated ; deep and wide valleys are considered .
Tau Air-Showers neutrinos at EeV energies might rise in AUGER , facing the Ande shadows and eventually linking twin fluorescence telescopes to better test horizontal-inclined Cerenkov blazing photons .
Tau air-showers may be revealed in ARGO being located within a deep valley testing inclined showers from the mountain sides ; MILAGRO ( and MILAGRITO ) on a mountain top might already hide records of horizontal up-going muon bundles due to far UHECR and less far ( but rarer ) tau air-showers at EeV .
MAGIC ( or Veritas and Shalon ) Telescopes pointing downward to terrestrial grounds acts , for EeV Tau neutrino air-showers astronomy , as a massive tens of km ^ { 3 } water equivalent detector , making ( in a given direction ) it at present the most powerful dedicated neutrino telescope .
MAGIC facing the sea edges must also reveal mirrored downward UHECR Air-showers ( Cherenkov ) flashes .
Magic-crown systems may lead to largest neutrino detectors in near future .
They maybe located on top mountains , on planes or balloons or in satellite arrays .
They may be screened in deep valleys .
Finally within cosmological relic light neutrino mass bounds ( suggesting \Sigma m _ { i } \simeq 0.18 eV ) a nearly degenerated neutrino mass m _ { i } \simeq 0.06 eV rises offering future possible Z-Showering signals originated by E _ { \nu } \simeq 60 ZeV and UHECR secondaries above GZK cut-off , up to E _ { p } \simeq ZeV .