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American Astronomical Society, Astrophysical Journal, 2(701), p. L87-L90, 2009

DOI: 10.1088/0004-637x/701/2/l87

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A note on the torsional oscillation at solar minimum

Journal article published in 2009 by R. Howe ORCID, J. Christensen-Dalsgaard, F. Hill, R. Komm, J. Schou, M. J. Thompson
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We examine the evolution of the zonal flow pattern in the upper solar convection zone during the current extended solar minimum, and compare it with that during the previous minimum. The results suggest that a configuration matching that at the previous minimum was reached during 2008, but that the flow band corresponding to the new cycle has been moving more slowly towards the equator than was observed in the previous cycle, resulting in a gradual increase in the apparent length of the cycle during the 2007 -- 2008 period. The current position of the lower-latitude fast-rotating belt corresponds to that seen around the onset of activity in the previous cycle. ; Comment: 10 pages, 4 figures, submitted to ApJ Letters