(Solved): The solar irradiance arriving at the Earth's atmosphere is measured to be around \( 1361 \mathrm{W ...

The solar irradiance arriving at the Earth's atmosphere is measured to be around \( 1361 \mathrm{Watts} / \mathrm{m}^{2} \). Given that the mean radius of the Earth's orbit is \( 149.6 \) million \( \mathrm{km} \) what is the irradiance arriving at the planet Mars assuming that its orbit has a mean radius of \( 228.9 \) million \( \mathrm{km} \) ? Please enter your answer in Watts \( / \mathrm{m}^{2} \) in the space provided.