Measurement of Total and Spectral Solar Irradiance |
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Authors: | G Rottman |
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Institution: | (1) Laboratory for Atmospheric and Space Physics, University of Colorado, Campus Box 590, Boulder, CO 80309-0590, USA |
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Abstract: | The Sun’s electromagnetic radiation powers our solar system. In the case of the Earth it heats the lands and ocean, maintains
our atmosphere, generates clouds, and cycles water. For other planets and minor bodies, similar and appropriate physical processes
occur, also powered by the Sun. The Sun varies on all time scales and a precise knowledge of the Sun's irradiance and its
variation is essential to our understanding of environments and physical conditions throughout our solar system. Measurements
of solar irradiance and its variation can only be made from space, and almost thirty years of observation have now established
that the total solar irradiance (TSI) varies by only 0.1 to 0.3%, while certain portions of the solar spectrum, the ultraviolet
for example, vary by orders of magnitude more. This paper provides an overview of TSI observations and of spectral irradiance
observations from the ultraviolet to the near infrared. |
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Keywords: | solar irradiance solar activity cycle climate variability atmospheric photochemistry instruments and techniques |
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