<P> Total solar irradiance (TSI)--the amount of solar radiation received at the top of Earth's atmosphere--has been measured since 1978 by a series of overlapping NASA and ESA satellite experiments to be 1.361 kilo ⁠ watts per square meter (kW / m2). TSI observations are continuing today with the ACRIMSAT / ACRIM3, SOHO / VIRGO and SORCE / TIM satellite experiments . Variation of TSI has been discovered on many timescales including the solar magnetic cycle and many shorter periodic cycles . TSI provides the energy that drives Earth's climate, so continuation of the TSI time series database is critical to understanding the role of solar variability in climate change . </P> <P> Spectral solar irradiance (SSI)--the spectral distribution of the TSI--has been monitored since 2003 by the SORCE Spectral Irradiance Monitor (SIM). It has been found that SSI at UV (ultraviolet) wavelength corresponds in a less clear, and probably more complicated fashion, with Earth's climate responses than earlier assumed, fueling broad avenues of new research in "the connection of the Sun and stratosphere, troposphere, biosphere, ocean, and Earth's climate". </P> <P> Different bodies of the Solar System receive light of an intensity inversely proportional to the square of their distance from Sun . A rough table comparing the amount of solar radiation received by each planet in the Solar System follows (from data in (1)): </P> <Table> <Tr> <Th> Planet or dwarf planet </Th> <Th_colspan="2"> distance (AU) </Th> <Th_colspan="2"> Solar radiation (W / m2) </Th> </Tr> <Tr> <Td> Perihelion </Td> <Td> Aphelion </Td> <Td> maximum </Td> <Td> minimum </Td> </Tr> <Tr> <Td> Mercury </Td> <Td> 0.3075 </Td> <Td> 0.4667 </Td> <Td> 14,446 </Td> <Td> 6,272 </Td> </Tr> <Tr> <Td> Venus </Td> <Td> 0.7184 </Td> <Td> 0.7282 </Td> <Td> 2,647 </Td> <Td> 2,576 </Td> </Tr> <Tr> <Td> Earth </Td> <Td> 0.9833 </Td> <Td> 1.017 </Td> <Td> 1,413 </Td> <Td> 1,321 </Td> </Tr> <Tr> <Td> Mars </Td> <Td> 1.382 </Td> <Td> 1.666 </Td> <Td> 715 </Td> <Td> 492 </Td> </Tr> <Tr> <Td> Jupiter </Td> <Td> 4.950 </Td> <Td> 5.458 </Td> <Td> 55.8 </Td> <Td> 45.9 </Td> </Tr> <Tr> <Td> Saturn </Td> <Td> 9.048 </Td> <Td> 10.12 </Td> <Td> 16.7 </Td> <Td> 13.4 </Td> </Tr> <Tr> <Td> Uranus </Td> <Td> 18.38 </Td> <Td> 20.08 </Td> <Td> 4.04 </Td> <Td> 3.39 </Td> </Tr> <Tr> <Td> Neptune </Td> <Td> 29.77 </Td> <Td> 30.44 </Td> <Td> 1.54 </Td> <Td> 1.47 </Td> </Tr> <Tr> <Td> Pluto </Td> <Td> 29.66 </Td> <Td> 48.87 </Td> <Td> 1.55 </Td> <Td> 0.57 </Td> </Tr> </Table>

What types of radiation does earth receive from the sun and how is each produced