Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..65b&link_type=abstract
Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,
Physics
Scientific paper
Cross sectional and time serial surveys of disk-integrated proxies of surface magnetic features in cool stars - those with non-trivial subsurface convection zones - have yielded information on stellar magnetic variability, which may express in one or more modes. For example, decadal magnetic variability is present on the sun and some lower-main sequence stars. Additionally, evidence for interdecadal magnetic variability, for instance, the solar Maunder Minimum of the 17^th century and first noted in the parameter of Sunspot Number, may also be present. Surface magnetic variability may be viewed as an expression of the action of a dynamo within or just below the convective zone that produces large-scale dynamo waves. Consequences for dynamo models will be discussed, based primarily on results from the near-four-decades-long monitoring program of Ca II H and K emission fluxes of lower main sequence stars at Mount Wilson Observatory, the precision photometry made at Lowell and Fairborn Observatory-Tennessee State University, and solar modulation imprinted in terrestrial ecosystems..
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