Correct Answer: incoming solar radiation

Solution : The correct option is incoming solar radiation .

Incoming solar radiation, often known as "insolation", is the solar energy or solar radiation that the Sun sends to the Earth's surface. It denotes the total quantity of solar energy received by a certain region or surface on the Earth. All wavelengths of sunlight are included in incoming solar radiation, from ultraviolet (UV) through visible light to infrared (IR). The amount of incoming solar radiation varies with time of day, geographic location, season and meteorological conditions.