Diffuse background of cosmic neutrinos at high energies

The atmospheric neutrinos dominate over the extra-terrestrial ones up to approximately 1014 eV; (though the flux of νsub(e) and antiνsub(e) from the central regions of the galaxy should equal that from the atmosphere from near-vertical directions at approximately 1013 eV). At higher energies (1016 eV) the diffuse flux is relatively uncertain and model-dependent with the values given below in units of km-2 sec-1 ster-1. The minimum value is 10-8; it represents the galactic flux off plane; in the galactic plane towards the center the flux is 10-8. If direct muon production in the atmosphere is accompanied by neutrino production, the atmospheric flux is 10-7. If cosmic rays are accelerated at young pulsars, interactions in the supernova shell would contribute 10-8 to 10-4. (a%thor)