* Latitude: The angle at which sunlight strikes the Earth's surface varies with latitude. The closer to the equator, the more direct the sunlight and the higher the solar radiation. At higher latitudes, sunlight strikes at a more oblique angle, spreading the same amount of energy over a larger area, resulting in less intense solar radiation.
* Time of Day: Solar radiation is highest at midday when the sun is highest in the sky. It decreases as the sun rises and sets.
* Time of Year: The Earth's tilt on its axis causes different parts of the planet to receive more direct sunlight at different times of the year. During summer, the hemisphere tilted towards the sun receives more intense solar radiation.
* Cloud Cover: Clouds reflect a significant amount of sunlight back into space, reducing the amount of solar radiation reaching the Earth's surface.
* Atmospheric Conditions: Dust, aerosols, and other particles in the atmosphere can absorb and scatter sunlight, affecting the amount of radiation reaching the surface.
* Altitude: Higher altitudes receive more direct sunlight, leading to higher solar radiation. This is because there is less atmosphere to filter the sunlight at higher elevations.
* Surface Albedo: The reflectivity of the Earth's surface (albedo) also plays a role. Snow and ice reflect a large portion of solar radiation, while darker surfaces like forests absorb more.
These factors combine to create a complex pattern of solar radiation distribution across the globe, influencing climate, weather, and ecosystems.
