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Evolution of Long Term Variability in Solar Analogs

Published online by Cambridge University Press:  12 September 2017

Ricky Egeland Open the ORCID record for Ricky Egeland [Opens in a new window] ,
Willie Soon ,
Sallie Baliunas ,
Jeffrey C. Hall  and
Gregory W. Henry
Ricky Egeland
Affiliation:
High Altitude Observatory/NCAR, 3080 Center Green Dr, Boulder CO, 80301, USA email: egeland@ucar.edu Dept. of Physics, Montana State University, P.O. Box 173840, Bozeman MT 59717, USA
Willie Soon
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
Sallie Baliunas
Affiliation:
No affiliation
Jeffrey C. Hall
Affiliation:
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA
Gregory W. Henry
Affiliation:
Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Blvd., Box 9501, Nashville, TN 37209, USA
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Abstract

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Earth is the only planet known to harbor life, therefore we may speculate on how the nature of the Sun-Earth interaction is relevant to life on Earth, and how the behavior of other stars may influence the development of life on their planetary systems. We study the long-term variability of a sample of five solar analog stars using composite chromospheric activity records up to 50 years in length and synoptic visible-band photometry about 20 years long. This sample covers a large range of stellar ages which we use to represent the evolution in activity for solar mass stars. We find that young, fast rotators have an amplitude of variability many times that of the solar cycle, while old, slow rotators have very little variability. We discuss the possible impacts of this variability on young Earth and exoplanet climates.

Keywords

Sun Activity Chromosphere Variability Climate Habitability
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 329 - 337
Copyright
Copyright © International Astronomical Union 2017 

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