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Detailed Reference Information |
Preminger, D.G. and Walton, S.R. (2005). A new model of total solar irradiance based on sunspot areas. Geophysical Research Letters 32: doi: 10.1029/2005GL022839. issn: 0094-8276. |
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We show that daily sunspot area can be used in a simple model to reconstruct daily variations in the total solar irradiance, S. The model assumes that all fluctuations in S are correlated with the emergence of sunspots on the solar disk. Cotemporal data for S and sunspot area are analysed to extract the finite impulse response function that describes the time evolution of S in response to a sunspot. The impulse response function clearly shows the evolution of a dark sunspot into a well-defined bright region which then spreads out and decays over a period of about 400 days. This function can be used to reconstruct S from the Greenwich daily sunspot area database, which extends from the late 1800's to the present. We find that the level of S at solar minimum has no long-term secular trend that is correlated with the level of sunspot activity. |
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Abstract |
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Keywords
Solar Physics, Astrophysics, and Astronomy, Solar activity cycle, Solar Physics, Astrophysics, and Astronomy, Solar and stellar variability, Solar Physics, Astrophysics, and Astronomy, Solar irradiance |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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