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Paper: The Torsional Oscillation and the Timing of the Solar Cycle: Is it Maximum Yet?
Volume: 478, Fifty Years of Seismology of the Sun and Stars
Page: 303
Authors: Howe, R.; Christensen-Dalsgaard, J.; Hill, F.; Komm, R.; Larson, T. P.; Schou, J.; Thompson, M. J.
Abstract: After the late start to Cycle 24 there are some indications that activity may have peaked as early as late 2011 and that the polar-field reversal has already occurred in the North. We use helioseismic measurements of the migrating zonal flow pattern known as the torsional oscillation to estimate the length of the solar cycle, and find that it has held steady at about 12.3 years since late 2009, which would point to solar maximum in 2013 as expected.
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