Solar physics and phenomena of the atmosphere of the Sun and solar-like stars, including solar/stellar flares, sunspots, active regions, filaments and prominences, quiet Sun network. Measurements of physical parameters of the solar atmosphere, such as magnetic fields, density, temperature, and energy distribution of electrons and ions in the photosphere, chromosphere and corona. Radio emission from the Sun and stars, radio emission mechanisms, radio instrumentation and techniques. Microwave spectral imaging of the Sun and stars. High-energy solar physics, including hard and soft X-ray, extreme-ultraviolet (EUV) and gamma-ray observations.