  The present status of the neutrino magnetic moment solutions of the solar
neutrino problem is summarized. After a brief review of the basics of the
neutrino spin and spin-flavor precession I discuss the experimental data and
show how the neutrino resonant spin-flavor precession (RSFP) mechanism can
naturally account for sizeable time variations in the Homestake signal and no
observable time variations in the Kamiokande and gallium experiments. Fits of
the existing data and predictions for the forthcoming solar neutrino
experiments are also discussed. In the last section I summarize the objections
to the RSFP mechanism that are frequently put forward and comment on them.
