The solar neutrino problem could arise from oscillation of one neutrino typ
e into a second type. Neutrinos would have a mass and there could be the po
ssibility of radiative neutrino decays. We discuss the search for neutrino
decays during the 1999 solar eclipse: it involves the emitted visible photo
ns, while neutrinos travel from the Moon to the Earth. The concept and the
main characteristics of the NOTTE experiment are presented.