Stars as Suns: Unravelling Long-term Solar Variability by Stellar Dynamo Modeling

Details Stars as Suns: Unravelling Long-term Solar Variability by Stellar Dynamo Modeling Stars as Suns: Unravelling Long-term Solar Variability by Stellar Dynamo Modeling

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh21b..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH21B-03

Physics

1650 Solar Variability (7537), 7544 Stellar Interiors And Dynamo Theory, 7999 General Or Miscellaneous

Scientific paper

We have developed a very time-efficient 2.5 D dynamo code to carry out simulations of stars that are very similar, but not identical to the Sun. The main goal is to better understand the nature and evolution of the solar dynamo by studying how its main characteristics (period, activity level) vary within the parameter space close to the observed or assumed input parameters and profiles that reproduce the solar dynamo, and by comparing these results with the periods, X-ray and Ca HK activity levels, that are known for many Sun-like stars. In particular we will carry out simulations for both the Babcock-Leighton (surface) and the mean field (convection zone) alpha-effect to determine which one better reproduces the dynamo periods and activity levels of Sun-like stars, and thereby is the more likely mechanism operating in stellar (and solar) dynamos. The relevance of this work is that a better understanding of the evolution of the dynamo mechanism will enable us to make more confident predictions for the Sun's variability spanning from solar cycle-like timescales to stellar evolutionary timescales. This will provide more reliable input for space weather and Earth's climate forecasters and increases our understanding of the long term evolution of the Sun's magnetic field and its subsequent effect on the Sun-Earth connection.

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