Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1443f&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 8, p. 1443-1446
Astronomy and Astrophysics
Astrophysics
7
Geomagnetism And Paleomagnetism: Time Variations-Diurnal To Secular, Global Change: Solar Variability, Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields
Scientific paper
Using sunspot observations from Greenwich and Mount Wilson, we show that the latitudinal spread of sunspot groups has increased since 1874, in a manner that closely mirrors the long-term (~100 year) changes in the coronal source flux, Fs, as inferred from geomagnetic activity. This latitude spread is shown to be well correlated with the flux emergence rate required by the model of the coronal source flux variation by Solanki et al. [2000]. The time constant for the decay of this open flux is found to be 3.6+/-0.8 years. Using this value, and quantifying the photospheric flux emergence rate using the latitudinal spread of sunspot groups, the model reproduces the observed coronal source flux variation. The ratio of the 100-year drift to the solar cycle amplitude for the flux emergence rate is found to be half of the same ratio for Fs.
Foster Simon
Lockwood Marian
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