Monopoles in the solar system

We discuss the Rubakov effect for monopoles in the solar system, paying a particular attention to the velocity dependence of the cross section of monopole-nucleus scattering. We found that (i) a strong constraint is obtained on the monopole abundance in the sun from the excess limit for the solar neutrinos with the average energy 35 MeV that would arise in the Rubakov process. This limit, when translated into that on the cosmic monopole flux, is almost as stringent as that from the excess luminosity of neutron stars. (ii) The limit can further be improved using massive underground detectors for the detection of the neutrinos from the sun. This could explore monopoles, even if their flux is as small as that constrained by neutron stars. (iii) With the monopole flux in the allowed range the intrinsic heat generation in the Jovian planets (or a considerable part of it) can be ascribed to the Rubakov heat due to the monopoles accumulated in the planets. (author)