We adopt the approach to the problem of neutrino oscillations in a magnetic field introduced in [1]
and extended to the case of three neutrino generations in [2] to investigate the impact of ultrahighenergy neutrino oscillations in the interstellar magnetic field. Based on the assumption that UHE
neutrinos flavour distribution follows the pattern 1:2:0, we have estimated the fluxes detected
by a terrestrial neutrino telescope. We find out that the interaction with a magnetic field does
not significantly modify the flavour distribution of UHE neutrinos unless they possess transition
magnetic moments.