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We calculate the yield of high energy neutrinos produced in astrophysicalsources for arbitrary interaction depths $\tau_0$ and magnetic field strengths$B$. We take into account energy loss processes like synchrotron radiation anddiffusion of charged particles in turbulent magnetic fields as well as thescattering of secondaries on background photons and the direct production ofcharm neutrinos. Meson-photon interactions are simulated with an extendedversion of the SOPHIA model. Diffusion leads to an increased path-length beforeprotons leave the source of size R_s and therefore magnetized sources losetheir transparency below the energy $E\sim 10^{18}{\rm eV} (R_s/{\rm pc})(B/{\rm mG}) \tau_0^{1/\alpha}$, with $\alpha=1/3$ and 1 for Kolmogorov andBohm diffusion, respectively. Moreover, the neutrino flux is suppressed abovethe energy where synchrotron energy losses become important for chargedparticles. As a consequence, the energy spectrum and the flavor composition ofneutrinos are strongly modified both at low and high energies even for sourceswith $\tau_0\lsim 1$.

High energy neutrino yields from astrophysical sources II: Magnetized sources