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Long‐term drift of the coronal source magnetic flux and the total solar irradiance
Author(s) -
Lockwood M.,
Stamper R.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900485
Subject(s) - irradiance , earth's magnetic field , solar irradiance , sunspot , solar minimum , flux (metallurgy) , solar cycle 22 , physics , solar cycle , coronal mass ejection , solar constant , solar maximum , coronal loop , atmospheric sciences , environmental science , magnetic field , solar wind , optics , materials science , quantum mechanics , metallurgy
We test the method of Lockwood et al [1999] for deriving the coronal source flux from the geomagnetic aa index and show it to be accurate to within 12% for annual means and 4.5% for averages over a sunspot cycle. Using data from four solar constant monitors during 1981–1995, we find a linear relationship between this magnetic flux and the total solar irradiance. From this correlation, we show that the 131% rise in the mean coronal source field over the interval 1901‐1995 corresponds to a rise in the average total solar irradiance Δ I = 1.65±0.23 Wm −2 .
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