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Joint Discussion 8 Solar and stellar activity cycles

Published online by Cambridge University Press:  01 August 2006

Alexander G. Kosovichev  and
Klaus G. Strassmeier eds.
Alexander G. Kosovichev
Affiliation:
W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085, USA email: sasha@quake.stanford.edu
Klaus G. Strassmeier eds.
Affiliation:
Astrophysical Institute Potsdam, D-14482 Potsdam, Germany email: kstrassmeier@aip.de
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The solar magnetic field and its associated atmospheric activity exhibits periodic variations on a number of time scales. The 11-year sunspot cycle and its underlying 22-year magnetic cycle are, besides the 5-minute oscillation, the most widely known. Amplitudes and periods range from a few parts per million (ppm) and 2–3 minutes for p-modes in sunspots, a few 10 ppm and 10 minutes for the granulation turn around, a few 100 ppm and weeks for the lifetime of plages and faculae, 1000 ppm and 27 days for the rotational signal from spots, to the long-term cycles of 90 yr (Gleissberg cycle), 200 - 300 yr (Wolf, Spörer, Maunder minima), 2,400 yr from 14C tree-ring data, and possibly in excess of 100,000 yr.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Highlights of Astronomy 14: Highlights of Astronomy , August 2006 , pp. 271 - 272
Copyright
Copyright © International Astronomical Union 2007