The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that<u> tropical regions generally have more available water and higher levels of </u><u>solar radiation.</u>
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What is solar radiation?</h3>
Solar irradiance, which is measured in the wavelength range of the measuring device, is the power per unit area received from the Sun in the form of electromagnetic radiation. Watts per square metre (W/m2) is the SI unit used to measure solar irradiation.
In order to report the radiant energy released into the environment (joule per square metre, J/m2) over a specific time period, solar irradiance is frequently integrated across that time period. The terms solar irradiance, solar exposure, solar insolation, and insolation are all used to describe this combined solar irradiance.
After atmospheric absorption and scattering, irradiance can be measured in space or at the Earth's surface. Distance from the Sun, the solar cycle, and cross-cycle fluctuations all influence irradiance in space. In addition, there is irradiance on Earth's surface.
To learn more about solar radiation from the given link:
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