The Torsional Oscillation and the Solar Minimum

Details The Torsional Oscillation and the Solar Minimum The Torsional Oscillation and the Solar Minimum

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.u34a..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #U34A-03

Astronomy and Astrophysics

Astrophysics

[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle

Scientific paper

The so-called torsional oscillation is a pattern of zonal flow bands, detected at the solar surface by direct Doppler measurements and within the convection zone by helioseismic measurements such as those carried out by the Global Oscillations Network Group and the Michelson Doppler Imager, that migrates from mid-latitudes towards the equator and poles with each solar cycle. In the current minimum the low-latitude branch of the pattern can be seen to have taken at least a year longer to migrate towards the equator than was the case in the previous minimum. A flow configuration matching that of the previous minimum was reached during 2008, and by early 2009 the fast-rotating belt associated with the new cycle had reached the latitude at which the onset of activity was seen in Cycle 23, but magnetic activity has remained low. We will present the most recent results and consider the implications for the new solar cycle.

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