Radio observations of Sun and solar wind

Solar radio observations from both ground-based and space-based have provided a wealth of data on various solar phenomena. In the recent years, particularly, coordinated studies using solar radio measurements and multi-wavelength data have provided a deeper understanding of solar flares and coronal mass ejections and the physics behind the fundamental processes of the radio emission mechanism. This chapter has two parts. In the first part, an overview of radio observations of quiet and active Sun is presented. The physics of explosive energy release is discussed. In the next part, the disturbances resulting from the solar phenomena and their heliospheric evolution in space and time is reviewed based on radio scintillation technique.