Radio emission can probe every part of the Sun's atmosphere, from the chromosphere just above the solar surface to the corona in which solar flares accelerate electrons to high energies and coronal mass ejections travelling at thousands of kilometers per second drive shocks. These phenomena can be seen with CARMA at millimeter wavelengths, with the Nobeyama Radio Heliograph and the Very Large Array at centimeter wavelengths, and with the Nancay Radio Heliograph and the Giant Metrewave Radio Telescope at meter wavelengths.