How many watts per square meter does the sun produce on earth?

The sun produces approximately 1,000 watts per square meter at the Earth's surface under clear sky conditions when the sun is directly overhead. This value can vary based on factors such as atmospheric conditions, the angle of sunlight, and geographical location. On average, the solar constant, which measures the amount of solar energy received outside the Earth's atmosphere, is about 1,361 watts per square meter. However, when accounting for atmospheric absorption and reflection, the effective energy reaching the surface is typically around 1,000 watts per square meter.