Long-term drift of the coronal source magnetic flux and the total solar irradiance

Details Long-term drift of the coronal source magnetic flux and the total solar irradiance Long-term drift of the coronal source magnetic flux and the total solar irradiance

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2461l&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2461-2464

Astronomy and Astrophysics

Astrophysics

61

Global Change: Solar Variability, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, And Astronomy: Solar And Stellar Variability, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

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 of Δl=1.65+/-0.23Wm-2.

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