It is shown that any interactions that involve charged particles with large momentum transfer are enhanced in an environment of plasma instability by stimulated emission or absorption of low-frequency radiation. This possibility suggests that high-energy solar neutrinos might lose their energy before reaching the Earth due to the enhanced cross sections around the Sun. It also sheds some light on the cause of solar flares, why the solar corona is hotter than the surface of the Sun, and the cause of supernova explosions, all of which are unsolved problems. Furthermore, with an appropriate optimal condition, it can yield an efficient neutrino detector.