Neutrinos in Random Magnetic Fields: The Problem of Measuring Magnetic   Moments
  The existence of magnetic moments of neutrinos points to physics beyond the standard model. Given current upper limits, terrestrial measurements are difficult or completely unfeasible. However, estimates of transition moments can be obtained from observation of objects such as active galactic nuclei (AGN) by means of neutrino telescopes. We describe the way of estimating the magnitudes of transition moments from such observations. 
G. Domokos and S. Kovesi-Domokos (Department of Physics and Astronomy,   The Johns Hopkins University)